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International Conference on Condensed Matter Photo-Physics 2020

iCAMP'20 was held in a split style, iCAMP’20 in summer and iCAMP’20 in winter. The former is an online conference and the latter face-to face conference. The face-to-face conference was held at a hotel Nen-Rin-Bou Takagamine Northern Kyoto which is located in a zone of fill in culture.

iCAMP'20 in winter

Nov. 30 (Mon.) through Dec. 1 (Tues.)

iCAMP'20 in winter was held at Japanese style Hotel Nen-Rin-Bou located 6Km north of Kyoto city center. Due to coronavirus pandemic we were obliged to hold an extremely small face-to-face meeting where we will have two invited presentation sessions and one discussion session.
Nevertheless, we got two questions and one comment to M-14 Manuscript, which will contribute to activate iCAMMP'20 in winter. Besides, we were happy to receive two opening addresses from two participants who were willing to attend the conference but missed to do so.

Opening Addresses
Dear conference participants, due to the pandemic it is impossible for me to take part in person. I very much regret this. I had planned to go to Japan once more in order to meet many friends whom I got to know 40 years ago during my 2-years stay at the ISSP of Tokyo University and during some later visits. But Corona does not allow it. I very much regret this.
So I can only greet you and welcome you in this address, and I wish you an interesting meeting with stimulating talks, fruitful discussions, and enlightening interactions.
I praise Professor Atsuo Matsui for his insistent efforts which made this conference come true. He worked hard to create this opportunity for our community of photo-physics researchers. It is really a pity that the pandemic created many unusual challenges for him and his co-organizers. All the more it is appropriate to thank him very very much: Domo arigato gozaimasu, Matsui-sensei.
With best regards
Prof. Dr. Michael Schreiber

Dear iCAMP’20 Participants, Dear Colleagues,
Welcome to the winter session of our Conference! Thank you for submitting your papers, and now special thanks for coming here in these difficult times. The summer session that took place in remote regime brought about many interesting ideas and some vigorous discussions. It is a pity that we could not discuss face to face, but this is just the peculiarity of the present year, which is absolutely exceptional – we have to do with the first pandemic in mankind history.
I deeply regret that these unusual circumstances have rendered my trip to Japan impossible. Yet, I find it admirable that a number of indomitable participants decided to attend despite all these obstacles. I admire you, thank you and wish you an excellent conference!
I express my gratitude to my fellow members of the International Advisory Board for their reviewing activity and other organizational contributions. My warmest thanks go to the Japanese organizers, especially to Professor Atsuo Matsui whose idea of a low-budget conference was the cornerstone of iCAMP’20 development. He also set the actual preparations on track and, assisted by Dr Yoshitaka Oeda, tirelessly pursued them in the ever changing maze of epidemic conditions and regulations.
Wishing all of you fascinating discussions and immunity to the Covid-19 virus, I remain
Sincerely yours
Piotr Petelenz

We had three sessions:
At the first session Prof. K. Matsuda gave us ardent full two hour talk on his recent work. At the last session, Prof. M. Kamada reported his tremendous works that was carried out at Synchrotron Radiation Facilities. Between the two sessions, we had a session to get prospect for the Condensed Matter Photo-Physics. Excursion to historic temples located in north of old capital Heian-Kyo gave us an opportunity to resume Japanese culture.

Online Discussion
M-14 (Shojiro Takeyama, Prof.)
... Question-1 (Piotr Petelenz, Prof. Nov. 24)
Is there a simple intuitive rationalization for the decrease of anthracene Davydov splitting in ultra-high magnetic field? Are there any theoretical calculations of this effect?
... Reply:(Nov. 27)
Nobody has ever thought of applying magnetic fields to anthracene, since the effect has been considered to be extremely small and a magnetic field available in a conventional laboratories is not sufficiently strong. Therefore, theories have never been attempted, as far as we know. The data in Fig.2 has been obtained by primitive instruments of our laboratory when started our project almost 40 years before, and accordingly the resolution of the spectra is very poor, and the peak shifts in magnetic field are not enough to deserve quantitative discussion about details of the mechanism. If we apply the same measurements with our newly developed system introduced in Fig.1, high-resolution spectra with much bigger effect would be expected, and we may be able to understand the mechanism based on quantitative analyses and a reasonable rationalization.

... Question-2 (Piotr Petelenz, Prof. Nov. 24)
Singlet fission in pentacene and its derivatives depends on the energy gap between the lower Davydov component of the S1 state and the spin-zero component of the triplet-pair state (with the two triplets residing at two nearby molecules). It seems that the said gap should depend on magnetic field, just as the Davydov splitting does. Would it be possible to modulate this gap (and thereby the fission rate) by using magnetic field?
... Reply:(Nov. 27)
This is indeed a very useful suggestion. I am not so sure, but it may be possible to modulate the gap and observe it by our new spectroscopic techniques in an environment of the 1000-class magnetic field system. It is a pity that I am a retired person and I myself cannot do anything. What I can do is simply wishing my successors to proceed the experiment someday in future.

... Comment-1 (Piotr Petelenz, Prof. Nov. 24)
The effect of pressure (to which the speaker alludes) is pretty simple to understand, since compression of the crystal increases the (stabilizing) overlap-dependent contributions to Frankel state energy (exchange and especially charge-transfer) which sensitively depend on intermolecular distance. The dependence of the dipole-dipole interaction also contributes, but its distance dependence is much weaker [Cf. Chem. Phys. 138, 35 (1989)]. What is the mechanism of magnetic field influence?
.. Reply:(Nov. 27)
First, we considered a possibility of exciton wavefunction shrinkage (diamagnetic effect), which would induce an effective increase of exciton localization within each molecule, accordingly, an inter-molecular interaction could possibly be reduced. However, we wondered whether a magnetic field of 150 Tesla is strong enough to induce such an effect (our observed reduction of Davydov splitting at 150 T is 50%) on an incompressive Frenkel exciton ( the exciton mass is estimated as ME//a=10 m0). According to the work by Otto et.al., they observed much larger increase of Davydov splitting induced by a pressure than that is expected from the purely dipolar interaction [ref.1]. If the diamagnetic shrinkage of excitons is responsible for our results, it suggests a breakdown of the conventional multipole expansion as suggested by Otto et.al. Other possible explanation would be magnetic field induced reorientation of the polarization moment [ref.2], or the change of the electron distribution in the lowest singlet excited state. In any case, we need to proceed this experiment using our new system applying our 1000 T class magnet to clarify the mechanism and answer to your question.
1) A. Otto, et al, Chem. Phys. Lett. 49, 145 (1977).
2) A. Yamagishi, J. of Phys. Soc. Jpn. 53, 298 (1984).


From JR Kyoto station: take subway to Kita-Oji stn or take municipal bus #205 to Kita-Oji bus terminal, then take municipal bus 北1 [北 means North ] and get off the bus at bus stop Yakaga-mine Genkou-an Mae

From Hankyu Shijyo-Kawaramachi :take municipal bus #205 to Kita-Oji bus terminal and then take municipal bus 北1   

Online Discussion in summer
M-01(Takaya Kubo, Prof.)
... Question-1 (Masao Kamada, Prof. July 7)
The author mentions that closely-packed colloidal quantum dot (CQD) assemblies work as light absorbers and carrier transporters. The enhancement of quantum effects in the dot is seemed to be against the carrier transportation. How does the carrier transportation possible in CQD?
... Reply:(October 5)
Colloidal quantum dots are those in which ligands such as long-chain alkyl are placed on the surface of the quantum dots and uniformly dispersed in an organic solvent, and Cd and Pb chalcogenides are typical compounds. In the case of quantum dots such as lead sulfide, the exciton binding energy is about 40 meV. Colloidal quantum dot assembly can be easily formed by solution-based methods such as a spin-coating method, thereby resulting in the enhancement of quantum dot coupling. By exchanging the original long insulating ligands with a small molecule such as halogen ion or ethanedithiol, the quantum dot coupling between them is further enhanced, which make it is possible for excitons to dissociate and diffuse between quantum dots as free carriers [1].
1. J. Gao et al., ACS Nano, 8, 12814-12825 (2014).

... Question-2 (Masao Kamada, Prof. July 7)
The author introduces the high quantum efficiency, 47 %, of the solar cell at the first exciton peak. How does the exciton contribute the carrier transportation, in spite of the charge neutrality?
... Reply:(October 5)
The carrier mobility of the quantum dot solid film formed by a simple coating method depends on the electronic coupling between the quantum dots (distance between the quantum dots) [2]. It has also been reported that (CdSe) has a carrier mobility of 400 cm2 / Vs [3]. Whether carrier transport occurs via carrier hopping or band-like transport is still debated today [4].
2. Y. Liu et al., Nano Lett. 10, 1960-1969 (2010).
3. J. Jang et al., Nano Lett. 15, 6309-6317 (2015).
4. X. Lan et al., Nature Materials, 19, 323-329 (2020).

M-02 (Masao Kamada, Prof.)
I, as one of the organizers, deeply appreciate your positive contribution to online iCAMP’20 discussion.
... Question-1(Atsuo Matsui, Prof. July 25)
I’d like to ask you about application of SOR (Synchrotron Orbital Radiation) because you have engaged in construction of SOR facilities for long. After the first facility was set up some 70 years ago, many SORs were constructed around the world for fundamental research, and maybe for application as well.
Nevertheless new SOR facilities are still under construction. For what purposes new SOR facilities will be used? Are they for application? If so, please enumerate the merit of construction, for instance, at Tajimi Japan.
... Reply:(October 9)
After the first SR about 70 years ago, many SR facilities have been constructed. Their grades have been dramatically improved, for examples, from parasite use to dedicated one, from dipole-magnet radiation to high-brilliant radiation provided by undulator or free electron laser. Up to now, SR has been attracting many scientists and engineers from universities, institutes, and industries in various fields such as medicine, pharmacy, biology, astro-science, archaeology, and ecology as well as basic researchers in condensed matters.

M-03 (Hisaaki Nishimuura, D2)
... Qestion-1(Masaaski Uchida, Prof. July 24):
New QD which has high photoluminescence QY and high transparency in visible region is reported.
How do you estimate/observe the size distributions of dots and layers, especially of the ZnS:Mn layer?
... Reply( Sept. 18): The thickness of the ZnS:Mn shell layer alone has not yet been directly measured. However, we have confirmed from electron microscopy that the ZnSe/ZnS:Mn/ZnS QDs have a particle size of 5 nm while the ZnSe-core QDs have a particle size of approximately 3 nm.

.... Question-2(Ayane Murano. August 18):
In the absorption spectrum of ZnSe QDs, the absorption peak is observed at 3.5 eV. Why did this peak disappear in the spectrum of ZnSe:Mn QDs prepared from the precursor solution with a pH of 9?
... Reply(sept. 18):
The spectral width of the absorption spectrum corresponds to the QD size distribution. In the ZnSe QDs prepared at pH 6, a clear absorption peak was observed because the size distribution is narrow.However, the ZnSe:Mn QDs prepared under alkaline conditions, the absorption spectra were obviously broadened because the size distribution was broad. This result is consistent with the results for non-doped ZnSe QDs [1]. [1] Y-S. Lee et. al., Chem. Lett. 45, 878 (2016).

... Question-3(Ayane Murano. August 18):
Why is the precursor solution used for the synthesis of ZnSe:Mn QDs better alkaline than acidic or neutral?
... Reply( Sept.18):
Several studies have reported that Mn ion is easily taken up under alkaline conditions[2,3]. The reasons for this are not entirely clear, but the difference in hydroxyl binding affinity to metal ions may give rise to different pH dependences with respect to the synthesis of semiconductor compounds[4].
[2]A. Aboulaich et. al.,Inorg. Chem. 49, 10940 (2010).
[3]M. Hardzei et. al., J. Lumin. 132, 425 (2012).
[4]L. Jing et.al., Chem. Rev. 116, 10623 (2016).

M-04 (Yusuke Funakawa, M2)
... Question-1 (Piotr Petelenz, Prof. June 25):
As follows from the recent comprehensive overview [A.C. Berends et al., J. Phys. Chem. Lett. 2019, 10, 1600], CuInS2 is an electrically extremely flexible semiconductor. Its surface, and even its bulk electrical properties, sensitively depend on the surrounding medium. Is the choice of poly (diallyldimethylammonium) chloride for embedding the CIS quantum dots targeted for some specific application? Or is the environment it provides expected to give a cue for some fundamental question concerning CIS bulk physics? Or is this paper just a synthesis-focused reconnaissance study? I would be grateful for some guidance in this regard.
... Reply(July 10):
Dear Professor Piotr Petelenz Thank you for your informative comments on the manuscript. We really appreciate it. The purpose of this study is to fabricate a layered structure of CuInS2 QDs and to investigate its basic optical properties. It is usually difficult to deposit a homogenous film of water-soluble CuInS2 QDs. But by the LBL method a homogenous film of CuInS2 QDs can be fabricated, and they can be laminated one by one particle. Therefore, in this study, we used this method to fabricate a layered structure of CuInS2 QDs and PDDA.

M-05 (Yong Shin Lee, D3)
M-06 (Manato Yoshida, M1)
... Comment-1(Yoshitaka Oeda, Dr. July 25):
Could you explain the steps 1.2 and 3 which are shown on p35 in M-06-D to demonstrate the process of making bilayer structures?
... Reply:(October 5)
We fabricated bilayer structures consisting of differently sized QDs. In this structure, efficient “vertical” ET from smaller QDs to larger QDs is realized like a donor-acceptor system. The bilayer structures were composed of three main blocks; the monolayer of larger QDs, which acts as energy acceptor QDs (A-QDs) (Step1), followed by the spacer layer of PDDA/(PAA/PDDA)n, where the notation of (PAA/PDDA)n represents the n-bilayers of PAA and PDDA (Step2), and the onolayer of smaller QDs as energy donor QDs (D-QDs) (Step3).

M-07 (Yoshiki Tanabe, M2)
... Comment-1 (Tadashi Itoh, Prof. June 25):
Concerning the paper “Evaluation of photoluminescence properties of CdTe quantum dot superlattices”, I would like to send you my comments as follows:
(1) Congratulation for your success in fabricating CdTe QDSLs by utilizing the amide bonds between NACs which are the ligands attached to single QDs. It may be an excellent method for making regular QD arrays.
(2) You have successfully observed that the PLE peak energy does not change even though the detection energy is different, contrary to the case of the QD solution with size distribution where the PLE peak energy does change when the detection energy is different.
(3) I think that the above phenomenon is a clear evidence of electronic relaxation among QDs in the QD arrays. There may be two kinds of interpretation for this phenomenon: one is the electronic resonance transfer by the formation of minbands in the QDSLs and the other is the phonon-assisted rapid energy transfer toward those QDs with larger sizes, caused by the overlapping of electronic excited states among adjacent QDs.
(4) I imagine that the former interpretation might be more probable because you have observed the periodic structural order of the QD arrays by means of x-ray diffraction measurement. However, the diffraction pattern might appear even if there is only a partial regularity inside the QD arrays. In order to confirm the formation of minibands, it may be desirable to get further experimental evidence such that the miniband energy width and/or the bandedge energy depends on the superlattice constant (that is the distance between adjacent QDs), for example, by changing the length of the ligand.
(5) Anyway, I enjoyed reading the paper very much. I hope your further success in the near future.
... Reply (June 27):
Thank you for your informative comments on the manuscript. We really appreciate it. Currently, we are fabricating samples with varying ordered structure scales and investigating the relationship between ordered structure scales and miniband formation. Through this research, we are trying to elucidate the phenomena occurring in the ordered structure.

M-08 (Mitsuru Hirao, M2)
... Comment and Question-1(Takeshi Ohno, July 23)
It’s interesting you found that CdSe/ZnS PL QY achieved 70% regardless of temperature.
By the way, how much is the PL QY of CdSe itself without forming CdSE/ZnS core/shell ?
... Reply (August 17):
Thank you for your comment and question on the manuscript.
The PL QY of bare CdSe is 1.5 %.

M-09(Atsuo Matsui, Prof.)
...Question-1 (Masao Kamada, Prof. July 7):
Is there any reason why the author focuses on pancreas cancer?
... Reply(July 11):
Curing pancreatic cancer is a promising target for medical doctors because pancreatic cancer is technically very difficult to perform an operation and the rest of the client life is fairly short. We therefore do not set it for the first target but place it in our FINAL target.
Why we are interested in curing cancer? Please reffer M-09 description, where we looked back the history of condensed matter photophysics and learnt that photo-physics research trend arrives at medical treatment of cancer.

... Question-2 (Masao Kamada, Prof. July 7)
How can you protect normal tissues in the skin and other regions from RF?
... Reply (July 11):
Our reply would not match with Q2, because our proposed technique is planned to reduce RF (in questioner's word).

... Comment-1 (Shingo Saito, Dr. July 13):
Because the cell contains much of water, we can treat the absorbance of water to THz wave as that of cell for the beginning. Absorbance of water to THz radiation is strong and THz wave can not penetrate into the deep area. It is important the consideration of the irradiation of THz wave for the future application.
.... Reply(July 14):
We appreciate very much for your keen comment on water molecule which absorbs THz light. Applying THz light to kill cancer cells is advantageous because (1) cancer cell includes lots of water molecules and (2) cancer cell is weak against heat. Please visit a diagram illustrated on page 30 in abstract-booklet, where you will learn how cancer cells are killed effectively by heat. On the other hand, as you suggested THz light is absorbed by water molecules on the light path and warms up water molecules on its path, which results in killing normal cells. Killing normal cells is however not too much as far as the THz light beam is squeezed down to make aperture small. We mean that the area (special extent), which is warmed up by THz light can be minimized. Please look at an illustration on Page 31, in which RF (1KHz~1 THz) wave hits human body over a wide range. Applying THZ light for cancer operation is therefore much favorable than to apply AF wave. The strong absorption of THz light by water is very effective to kill cancer cells located at the surface of the organ. However, due to strong absorption of THz light by water molecules the light does not come into deep in the organ where cancer cells are located. We have to develope a technique to bring THz light into deep inside human body.

M-10 (Piotr Petelenz, Prof.)
... Question-1(Ken-ichi Mizuno, Prof. July 15):
I’m not familiar with the names of two molecules, oligothiophene and sexithiophene. Could you demonstrate the constitutional structures of both molecules, together with their crystal structures?
... Reply: (August 3)
The names are decreed by the normal rules of chemical terminology. “Sexi” (from Latin) means “six”, and refers to the number of constituent thiophene rings that form this molecule. The standard in organic chemistry was to use in similar contexts Greek numerals (it would be “hexa” in this case), but the first authors intended to make the name somewhat frivilous. “Oligo” means “a few” (in contrast to “poly”, meaning “many”, which applies to polymers). To date, I have come across papers on bi-, ter-, quater-, quinque-, sexi-, septi-, octi- thiophene which consist of 2 to 8 thiophene rings. These are all oligothiophenes. There is (to my knowledge) no precise limit on the number that can be called “a few” (“several”). Septithiophene and octithiophene (7 and 8 rings, respectively) probably also count as oligothiophenes; although I would be rather hesitatant to use the term in these cases. For example, the structural formula for 6T (sexithiophene) is

Exemplary crystal structures are available in S. Möller, G. Weiser, F. Garnier, Phys. Rev. B 61, 15 749 (2000), P. Hermet, J.-L. Bantignies, A. Rahmani, J.-L. Sauvajol, M. R. Johnson, J. Phys. Chem. A 2005, 109, 4202-4207

... Comment-1 (Ken-ichi Mizuno, Prof. July 15)
Your abbreviations, UV/Vis, will not be understood by young graduate students, especially “Vis” is not popular among photo-physics researchers.
... Reply (August 3):
Many thanks for the comment. I apologize for using the abbreviation that among the spectroscopists known to me is standard. It stands for ultraviolet/visible.

... Question-2 (Ken-ichi Mizuno, Prof. July 15)
It is hard for me to figure out molecular arrangement in twin crystal, that is, the meaning of the word “twinning“ is not clear to me.
... Reply (August 6): “Crystal twinning” is a standard term in crystallography and geology. The definition is cited below: Crystal twinning occurs when two separate crystals share some of the same crystal lattice points in a symmetrical manner. The result is an intergrowth of two separate crystals in a variety of specific configurations. The surface along which the lattice points are shared in twinned crystals is called a composition surface or twin plane. The above is cited from: https://en.wikipedia.org/wiki/Crystal_twinning (3 Aug 2020), where examples are also presented.
A twin crystal may be viewed as a specific case of a crystal pair, fused in high-symmetry configuration. On microscopic scale, in junction regions the lattice may be locally distorted, i.e. some molecules (or other crystal basis, depending on the kind of the crystal) may be somewhat displaced with respect to their normal positions, or some may be missing (like in the dislocation case).
[Cf. https://en.wikipedia.org/wiki/Dislocation (3 Aug 2020)].
In molecular crystals, the crystal structure is determined by the weak Van der Waals forces. In effect, the energy gaps between different local geometries are small, so that a narrow energy interval may encompass many local energy minima corresponding to a variety of different local configurations. For this reason, disordered phases often emerge, and it is usually difficult to grow large single crystals of this kind. It is quite common that in macroscopic samples the ordered crystallites are separated by disordered regions.
Our model is an idealized image of two fused macroscopic crystals, symmetry-related or not, that may either share some composition surface or be connected by a disordered layer which is sandwiched between them, and is sufficiently thin to make its contribution negligible for a macro-scale spectroscopic measurement. Thus, the structure of the junction region is irrelevant for our argumentation.

...Question-3(Ken-ichi Mizuno, Prof. August 10):
How to distinguish “Twin” crystals?With naked eyes, or by using special tools, or by specific techniques?
... Reply:(October 9)
Offhand, there is no unequivocal answer. Some large twin crystals are recognizable at first glance (spectacular examples of twin mineral crystals are shown in Wikipedia). On the other hand, it is perfectly possible that one of the twins is very thin, and in that case a more complex study may be needed, using at the very least a polarized light microscope. In more difficult cases, a thorough X-ray analysis may be necessary (some reflexes of a twin crystal would be doubled).
As a theoretician, I have never had to do with a practical problem of this kind. Our paper was inspired by the exithiophene case for which we were calculating and interpreting the spectra, and found out that the original interpretation suggested by the (experimentalist) authors of the paper we were basing on was internally contradictory in some respects.

M-11 (Ayane Murano, M2)
...Question-1: (Masao Kamada, Prof. July 7):
Please let me know the detailed explanation of N 1s XPS spectra. What is origin of the shoulder at 396 eV?
...Reply (July 17):
Thank you for your questions on my manuscript. I will answer your questions. The presence of the main peak and shoulder implies the presence of two types of nitrogen. The binding energy of the main peak corresponds to that of 6-coordinated bulk nitrogen in TiN. It is thought that the origin of the shoulder is nitrogen bound to the titanium on the surface of oxidized powder [1] or nitrogen substituted for oxygen in TiO2 [2]. In both cases, such nitrogen has a low coordination number than that in TiN. Due to the sputtering procedure, the surface structure was uniformly changed to be observed a single band. [1] C. M. Zgrabik, and E. L. Hu, Opt. Mater. Express 5 (2015) 2786.
[2] A. Achour, et al., J. Power Sources 300 (2015) 525.

... Question-2: (Masao Kamada, Prof. July 7)
The intensity of N 1s XPS spectra decreases at high temperatures. Does this indicate the desorption of nitrogen atoms during the heat treatment?
...Reply(July 17):
Yes. With increase in heating temperature, the oxidation with desorption of nitrogen proceeds from the surface of the powder particle. The fraction of nitrogen is considerably small in observable range of XPS measurement. However, diffuse reflectance and XANES spectra indicate that nitrogen still remains in the particle enough to observe.

M-12 (Yoichiro Mushiaki, M2)
... Suggestion-1(Yoshitaka Oeda, Dr. July 25):
Your paper is well organized.
If you show the structure of YIG, it will be much easier for us to understand your paper .
... Reply: (July 30)
Thanks for your suggestion. The whole crystal structure of YIG, which is categorized as a garnet-type structure (space group la3d), is cubic, but the local structure is very complicated. The figure of YIG structre may not necessarily be instructive to understand our paper. It would be great if you refer to the figure in the related article below.

... Question: (Ayane Murano, August 7)
I would like to ask you two questions. I’m not familiar with magnetism.
... Question-1
What is the difference between the first and second order magneto electric effect?
... Reply:(October 9)
It is considered that the first order magneto-electric effect is caused by the oxygen vacancies. As for the second order magneto-electric effect, we do not know the physical origin.

... Question-2
In Figure 3, the fractions r1 and r2 change significantly around 200 K. What does this mean?
... Reply:(October 9)
The first-order signal appears at any temperature, while the second-order signal appears above 200 K. We are sorry, but we do not know the reason for the sudden rise of the fraction r2 at around 200 K.

M-13 (Yusuke Iwasaki, D1)
... Question-1 (Yoshitaka Oeda, Dr. July 23)
In your experimental set up to obtain THz-TDS, three lenses are applied.
What is the material of each lens?
... Reply:(July 27)
The material of the lenses is BK7 glass. Laser pulses go through the lenses, but the THz wave does not go through any of the three lenses.

... Question-2( Keiichiro Nasu, Prof. Aug 8)
How your newly obtained results are related to the whole nature of the magnon or its dispersion, and also how your results are related to the whole nature of the antiferromagnetism in CoO, as new findings?
... Reply:(September 30)
In our experiment, the observed magnons are only those for k=0, and the magnon dispersion cannot be observed. The magnon mode at 4.4 THz was reported on the experiments of Raman scattering and optical pump-probe. However, no THz-TDS experiment has been reported.
In this study, we broadened the bandwidth of THz-TDS by using air plasma that can detect broader bandwidth THz waves than inthe case of ZnTe.
We attempted to observe magnon absorption in CoO using wide band THz-TDS. However, the absorption signal is small and disappears when the temperature is raised.
We are sorry but the detailed discussion on the magnon of CoO is difficult for us at present.

... Comment-1 (Yoshitaka Oeda, Dr. August 26)
Concerning “3 Experiment” in your manuscript, your description on THz light generation is clear and comprehensible. However, the logic of your description to the detection region (in your terminology) is dim and difficult to understand. Please tell us your saying more concretely.
... Reply:(September 30)
In the detection region, air plasma is generated by the focused 800-nm probe light. The electric-field amplitude of the THz wave is detected as the intensity of the 400-nm light, which is generated by the sum frequency generation due to the four-wave mixing, where two 800-nm photons and THz wave generate a 400-nm photon. The air plasma, which has high 3rd-order nonlinear susceptibility, increases the generation efficiency.

M-14(Shojiro Takeyama, Prof.)
... Gratitude (Atsuo Matsui, Prof. July 26):
It is a great honor for us organizers to welcome Prof. Shojiro Takeyama to an invited presenter for iCAMP’20, since he has achieved a world record of magagaus generator at ISSP (Institute for Solid State Physics).
... Reply:(October 5)
It was my great honor to be invited to present my recent work of "generation of 1200 Tesla and application to solid state physics" to iCAMP'20. I have been impressed by many successful and interesting contributions of scientific diversity. I would like to express my deep appreciation for unflagging enthusiasm to this conference of Prof. Matsui. by Shojiro Takeyama

M-15 (Yuki Maeda, D1)
... Comment-1 (Atsuo Matsui, Prof. July 26):
Could you demonstrate the crystal structure of Cr2O3 with which we can understand your paper better?
... Reply:(July 28)
Thank you for your comment. Yes. The crystal structure can give a better understanding of our paper. Please refer to the related papers.
for example; A. Malashevich et al., Phys. Rev. B 86, 094430 (2012).

M-16 (Toshiro Kohmoto, Prof.)
... Lecture requested-1 (Yoshitaka Oeda, Dr July 27)
Would you please explain the experimental technique “pump-prove technology”?
... Reply:(October 12)
The pump-probe techniques are the techniques for investigating dynamic processes in materials, where a pump pulse excites a sample and a probe pulse is used for probing the sample after the pulse excitation. In our experiment, the sample is excited by a linearly polarized pump pulse(800 nm, 0.2 ps), and the time evolution of the reflection change or birefringence induced by the pump pulse is observed by using a cw probe light (1064 nm).
For example, refer to the following homepage for a more detailed explanation about the pump-probe technique. https://en.wikipedia.org/wiki/Time-resolved_spectroscopy

M-17 (Ivan G. Scheblykin, Prof.)
M-18 (Richard J. Cogdell, Prof.)
... Question-1 (Yoshitaka Oeda, Dr. May 20):
Your manuscript is very interesting. Unfortunately, however, I do not understand a word "refix" in your manuscript.
... Reply (May 21):
Refix means to reabsorb. Carbon dioxide was originally removed from the atmosphere by photosynthetic activity and then put back into the air by burning fossile fuels.

... Questions (Yoshitaka Oeda, Dr. July 7):
My understanding on your manuscript M-18 is described below.Is my understanding perfect?
The amount of carbon dioxide on the earth is reduced by photosynthesis (dark reaction) which fixes carbon dioxide to carbohydrates. The energy conversion efficiency from sunlight energy into photosynthesis (light reaction) of plants is small less than 1%. . Besides, the efficiency of dark reaction is poor. Contrary to the energy conversion in planets, in solar cells the energy conversion efficiency is about 20%, which may supply much energy to plants for photosynthesis (dark reaction). This suggests that solar cells can fix more carbon dioxide into carbohydrates effectively.
Asuming my understanding is perfect, I have a few questions.
... Question-2 (Yoshitaka Oeda, Dr. July 7)
How is the electric energy obtained from the solar cell supplied to the photosynthesis (dark reaction) cycle?
... Question-3 (Yoshitaka Oeda, Dr. July 7)
Even if the energy conversion efficiency is increased by the solar cell, I think the generated amount of carbon dioxide does not increase if the efficiency of photosynthesis (dark reaction) is the same. How is it?
.... Reply to Question-2, and 3 (July 13):
The energy harvested by the solar cell would be used to power carbon dioxide fixation. However, the idea the idea would be to not use a photosynthetic organism directly but to engineer, probably, a bacterium that can derive its energy from electricity (such as Geobacter) to use carbon dioxide to make medium chain hydrocarbon products, such as farnesene. In this way you gain the benefit of high efficiency and tailor the product to one you desire.

... Question-4 (Yoshitaka Oeda, Dr. July 7)
Does the carbohydrate conversion efficiency by photosynthesis (dark reaction) vary greatly depending on the type of plant?
.... Reply (July 13):
Yes, some plants can be more efficient. So far, the best are algae. But you have to distinguish between actual operating efficiency and the theoretical maximum efficiency. There is usually a big gap between the two!

... Question-5 (Yoshitaka Oeda, Dr. July 7)
As a method of converting carbon dioxide to carbohydrates, what is the advantage of photosynthesis (dark reaction) compared to the other inorganic methods?
.... Reply (July 13):
So far, inorganic methods do not work at atmospheric concentrations of carbon dioxide. They only work at high carbon dioxide concentrations and usually high temperature too. Photosynthesis is the only major process that can work at 0.04% carbon dioxide concentrations.

M-19(Kazunari Matsuda, Prof.)
M-20 ( Juergen Koehler, Prof.)

We are very sorry but we have to announce that Prize Nomination Committee have missed to find a graduate student participant who satisfies their criteria for Excellent Presentation Prize.

Scope: This conference has been planned to discuss topics across all fields of Condensed Matter Photo-Physics. To promote our research activities further we should bring in young researchers with wide-ranging views and pioneering spirits. Looking back at the history of condensed matter photo-physics over the past 100 years, new concepts and ideas were often triggered by people working on the outskirts of traditional research realms. Therefore, we wish to take in fresh blood.

Owing to COVID-19 pandemic, iCAMP’20 will be held under a novel design; iCAMP’20 in summer does not include any meeting where participants get together, that is, we will not have oral and poster sessions there.

Nevertheless, we will keep our policy to encourage young participants to present their papers in good shape to distribute their new results. This new presentation style will probably press young participants to enforce additional effort to polish their manuscripts. We hope they overcome this severe barrier and obtain higher educational capacity.

International Organizing Committee (IOC): Prof. Atsuo Matsui (Chairman, Japan), Prof. Piotr Petelenz (Poland), Prof. Ivan Scheblykin (Sweden), Secretary: Dr. Yoshitaka Oeda (Japan)

Local Organizing Committee (LOC): Prof. Tadashi Itoh (Osaka Univ.), Prof. DaeGwi Kim (Osaka City Univ.), Prof., Atsuo Matsui (Chairman, Organo-Optic Research Lab.), Dr. Yoshitaka Oeda (Organo-Optic Research Lab.)

International Advisory Board (IAB): Prof. Takaya Kubo (Univ. of Tokyo), Prof. Keiichiro Nasu (KEK), Prof. Shojiro Takeyama (Univ. of Tokyo), Prof. Takenari Goto (Tohoku Univ.), Prof. Maria Antonietta Loi (Univ. of Groningen ), Prof. Masao Kamada (Saga Univ.), Prof. Dr. Michael Schreiber (Technische Univ. Chemnitz), Prof. Masaaki Nakayama (Osaka City Univ.), Prof. Kazunari Matsuda (Kyoto. Univ.), Prof. Dr. Jürgen Köhler (Univ. Bayreuth), Prof. Richard Cogdell (Univ. of Glasgow)

Conference schedule:
(1) Registration deadline March 31, 2020
(2) Manuscript submission deadline May 31, 2020
Manuscripts (Abstract, brief Note, or a longer Report are all agreeable) will be bound in a booklet, which we address ' abstract-booklet' and 'datum-booklet'. Both booklets will be sent in late June to all the participants (registrants) by domestic mail or by international surface mail because air mail from Japan to overseas countries are not available. We would like to ask you not to make any copy and not to cite any datum on the datum-booklet. The datum-booklet should be destroyed immdeiately after iCAMP'20 in winter, Dec. 1. 2020, because some authors want to keep their data not open to public before publishing them in international journal. All Rights Reserved.

(3) Registration fee payment dead line May 31, 2020. When your registration fee payment is received you will get a confirmation email sent from iCAMP'20 office. The registration is common through two conferenes in summer and in winter.

Registration fee: 6000 JPY or 55 USD or 50 EURO, the fee is waived for retired researcher.

Registration: Should be emailed to iCAMP'20 office ( icamp20@gaia.eonet.ne.jp) as a script file which includes

  • (1)Full Name (Family name, First name, Middle name, Japanese character name and ICC ID if you have)
  • (2)Title (e.g. Professor, Dr, D2, M2, Prof. Retired, Researcher Retired, etc)
  • (3)Institute: Name and its Address + Phone and FAX numbers
  • (4)Email address of your own and mailing address where you wish to receive conference book
  • (5)If you are the corresponding author, give us
  • ➀Title of your paper
  • ➁Every participant has an equal opportunity to present his/her paper as the first author only once during this conference.

Manuscript (Abstract, brief Note, or a longer Report) for abstract-booklet:
  • (1) Manuscript and datum submission are May 31, 2020.
  • (2) 1~ 5-pages or over is allowed for each contributed paper and for an invited paper as well.
  • (3) Apply Microsoft Word on size A4 paper.
  • (4) Keep paper size A4 strictly: 210mm x 297 mm (8.3 inches X 11.7 inches)
  • (5) Leave margins on both the sides, left and right 19.05 mm (0.75 inches), and 25.4 mm (1.0 inches) for top and bottom.
  • (6) Do not put on page number.
  • (7) Manuscript should include: ・Title ・Author’s name (s) (corresponding author should be indicated with underline, and his/her email address) ・Author’s affiliation(s) ・Key words
  • (8) Send manuscript in pdf file to iCAMP’20 office ( icamp20@gaia.eonet.ne.jp)

Datum (Data, diagram, picture, etc.) for datum-booklet:
  • Datum-booklet is planned to get better communications among participants. Please keep the same format on you datum sheet as applied to you manuscript for abstract-booklet, the same sheet size and the same margin around the paper.

    Those who wish to present your personal picture on datum-booklet, please send your picture to iCAMP’20 office in jpg file, maybe together along with your datum.

    Topics(Key words): application of condensed matter photo-physics, atomically thin materials, excitonic processes, experimental techniques, high-magnetic field, high pressure, inorganic and organic materials, luminescence, modulation spectroscopy, nano-particles, near-field spectroscopy, non-linear spectroscopy, biological systems, phonons, photo-induced phase change, photonic crystals, quantum dots, quantum entanglement and information processing, semiconductors, single molecule spectroscopy, solar cells, new techniques, thin films, THz spectroscopy. ultra-fast spectroscopy, VUV spectroscopy and others

    Invited Paper:
    • M-14 Prof. Shojiro Takeyama, Univ. of Tokyo "Magneto-optical approach to megagauss magnetic fields"
    • M-01 Prof. Takaya Kubo, Univ. of Tokyo " Colloidal Quantum Dots and Next Generation Photovoltaics"
    • M-18 Prof. Richard Cogdell, Univ. of Glasgow "What can we learn from photosynthesis about how to harvest solar energy"
    • M-20 Prof. Juergen Koehler, Univ. Bayreuth "Contribution of low-temperature single-molecule techniques to structural issues of photosynthetic light-harvesting antennae"
    • M-19 Prof. Kazunari Matsuda, Kyoto Univ. "Emerging Optical Physics and Application of Nano-carbon and Atomically Thin Materials"
    • M-02 Prof. Masao Kamada, Saga Univ. "Dynamics of Core- and Valence-Excited States Studied with Synchrotron Radiation and Laser"
    • M-17 Prof. Ivan G. Scheblykin, Lund Univ. "Charge recombination goes digital: the case of luminescent nanostructured perovskite semiconductors"


    Our grateful acknowledgement goes to KANSAI-OSAKA 21st Century Association for their financial support.

    We also acknowledge individual supporters, Prof. Ken-ichi Mizuno (Japan), Kathy Walker-Isaac (California), Ichiro Akai (Japan), Takeshi Ohno (Japan), Prof. Keiichiro Nasu (Japan), Prof. Takenari Goto (Japan), Prof. Takaya Kubo (Japan) and ICC ( HP http://www.eonet.ne.jp/~icc-office/icc.html )

    Guide for private tour

    contact: icamp20@gaia.eonet.ne.jp