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FoPM International Symposium

Feb 17 – 19, 2025
Ito International Research Center and Yayoi Auditorium
Asia/Tokyo timezone

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Contribution List

186 / 186
1. Welcome
Prof. Shin-ichi Ohkoshi (University of Tokyo)
2/17/25, 9:30 AM
2. Logistics
Dr Kate Harris (University of Tokyo)
2/17/25, 9:35 AM
3. FoPM
Prof. Hitoshi Murayama (Kavli IPMU)
2/17/25, 9:40 AM
18. Machine Learning the Universe: Testing cosmological theories with galaxy surveys
Prof. Bhuvnesh Jain (University of Pennsylvania)
2/17/25, 10:00 AM
31. Hofstadter buttterfly of topological phases
Hiroyuki SUDO
2/17/25, 11:00 AM
43. How hot cools faster than cold: Universal microscopic theory of Mpemba effects
Naruo OHGA
2/17/25, 11:00 AM
25. Optical response of edge modes in time-reversal symmetric topological superconductors
Hirokazu KOBAYASHI
2/17/25, 11:00 AM
37. Waveform inversion for the 3D S-wave velocity structure in D″ beneath the Hawaiian Islands
Keisuke OTSURU
2/17/25, 11:00 AM
38. Extension of optimal transport to chemical reaction network
Ryuna NAGAYAMA
2/17/25, 11:15 AM
32. Quasiperiodicity and superconductivity
Mao YOSHII
2/17/25, 11:15 AM
44. TBA
Shinichi ARITA
2/17/25, 11:15 AM
26. Transport theory of an electron-phonon system: Crossover from phonon drag to phonon-mediated electron hydrodynamics
Keigo TAKAHASHI
2/17/25, 11:15 AM
33. GLTCAM: Ultra-wideband and easy-to-array 180° Hybrid design for mm/submm continuum imaging
Shuhei INOUE
2/17/25, 11:30 AM
27. Probing nonlinear spin-wave dynamics using diamond quantum sensors
Kensuke OGAWA
2/17/25, 11:30 AM
45. Reducing qubit usage in entanglement distillation protocols for distributed quantum computation
Kosuke MATSUI
2/17/25, 11:30 AM
39. TBA
Kosuke FUJIWARA
2/17/25, 11:30 AM
40. Dynamic nuclear polarization with boron vacancy in hexagonal boron nitride
Yuki NAKAMURA
2/17/25, 11:45 AM
34. Fermionic CFTs from error-correcting codes and orbifold theories
Shinichiro YAHAGI
2/17/25, 11:45 AM
46. Fock State Generation with Aperiodic-Poled KTiOPO4 Waveguide
Takefumi NOMURA
2/17/25, 11:45 AM
28. Seeds of Massive Stars Revealed by Radio Observations
Kaho MORII
2/17/25, 11:45 AM
41. Building a bridge between two approaches to studying the space of smooth embeddings
Leo YOSHIOKA
2/17/25, 12:00 PM
35. Observation of chiral domain walls in an octupole-ordered antiferromagnet
Moeta TSUKAMOTO
2/17/25, 12:00 PM
47. Structural Fluctuation in Phase Transition of Crystalline Materials
Masaya SAKAKIBARA
2/17/25, 12:00 PM
29. Toward label-free observation of single proteins
Masato SAWA
2/17/25, 12:00 PM
36. Games with backtracking options for (quantitative) unprovability results
Eitetsu KEN
2/17/25, 12:15 PM
42. Neutrino mass ordering determination in Super-Kamiokande-Gd
Shintaro MIKI
2/17/25, 12:15 PM
48. Spin Nernst and thermal Hall effects of topological triplons on maple-leaf/star lattice antiferromagnets
Nanse ESAKI
2/17/25, 12:15 PM
30. TBA
Yingdong LUO
2/17/25, 12:15 PM
4. Discrete Painlevé Equations and Quantum Minimal Surfaces
Prof. Andy Hone (University of Kent)
2/17/25, 2:00 PM
5. Illuminating Earth's Dynamic Deep Interior: Multi-scale structures and their significance
Prof. Edward Garnero (Arizona State University)
2/17/25, 2:30 PM
6. From PhD to MEXT: My Personal Career Journey
Dr Tetsuyuki Muramatsu (MEXT)
2/17/25, 3:00 PM
54. Monte Carlo methods for quantum lattice models (tentative)
Sora SHIRATANI
2/17/25, 4:00 PM
64. Mystery of arithmetic geometry and p-adic differential equations
Peiduo WANG
2/17/25, 4:00 PM
59. Observation on Galaxy Protoclusters Hints AGN feedback on IGM Scale
Chenze DONG
2/17/25, 4:00 PM
49. Quantum communication between fixed-frequency superconducting qubits using an itinerant microwave photon
Takeaki MIYAMURA
2/17/25, 4:00 PM
65. Nuclear reaction in muonic atoms
Rurie MIZUNO
2/17/25, 4:15 PM
60. Spontaneous leptogenesis
Hiroki TAKAHASHI
2/17/25, 4:15 PM
50. Theory of open quantum many-body systems
Koki SHIRAISHI
2/17/25, 4:15 PM
55. Ultrafast all-optical universal squeezer of single-photon states
Tatsuki SONOYAMA
2/17/25, 4:15 PM
51. Asymptotic property of point process regression
Yoshihiro GYOTOKU
2/17/25, 4:30 PM
56. Mining for Protoclusters at z ∼ 4 from Photometric Data Sets with Deep Learning
Yoshihiro TAKEDA
2/17/25, 4:30 PM
61. Programmable control of temporal waveform of fragile optical quantum states
Hiroko TOMODA
2/17/25, 4:30 PM
66. Subaru PFS: Search for intermediate-mass black holes
Kota HAYASHI
2/17/25, 4:30 PM
62. Cellular response to mechanical stimulation
Tomoya MUKAI
2/17/25, 4:45 PM
57. Investigation of Taxol distribution and toxicity in Drosophila L3 larvae
Tsubasa KOBAYASHI
2/17/25, 4:45 PM
67. Proposal of unitary-transformed projective squeezing
Keitaro ANAI
2/17/25, 4:45 PM
52. Strong CP problem
Risshin OKABE
2/17/25, 4:45 PM
63. A possible simple proof of the Bott periodicity theorem
Masaki NATORI
2/17/25, 5:00 PM
68. Inferring mantle flow beneath the Pacific Ocean from seismic anisotropy
Ikuchi FUNAHASHI
2/17/25, 5:00 PM
53. Quantitative elucidation of Akt isoform-specific effect on cellular morphology change using optogenetics and a mathematical model
Yuka SEKINE
2/17/25, 5:00 PM
58. Superconducting Vortex Nucleation Induced by Self-Field of Current
Shunsuke NISHIMURA
2/17/25, 5:00 PM
69. Nonequilibrium hysteretic phase transitions in periodically light-driven superconductors
Huanyu ZHANG
2/17/25, 5:15 PM
7. A Rakugo Performer’s Take on Imagination: What is the purpose of the “makura”? (落語家が語る《想像力》～マクラは何のためにあるのか)
Mr Fukumaru Katsura
2/18/25, 9:00 AM
8. Multiscale Organization of Neuronal Activity Unifies Scale-Dependent Theories of Brain Function
Prof. Mac Shine (The University of Sydney)
2/18/25, 9:30 AM
9. Gender Balance in Japanese Higher Education
Prof. Ginko Kawano (Kyushu University)
2/18/25, 10:00 AM
87. Cosmic Birefringence : a hint of new physics
Fumihiro NAOKAWA
2/18/25, 11:00 AM
76. Deformation of heat kernels and Brownian motion from the viewpoint of Ben Saïd-Kobayashi-Ørsted (k,a)-generalized Laguerre semigroup theory
Temma AOYAMA
2/18/25, 11:00 AM
81. Demonstration of selective quantum teleportation toward switching-free quantum computation
Akito KAWASAKI
2/18/25, 11:00 AM
70. Solitons and scars in 1d interacting chiral fermion systems as qKdV equation
Shunta KITAHAMA
2/18/25, 11:00 AM
82. Discovery of a massive bulge-dominated galaxy in the early Universe
Akiyoshi TSUJITA
2/18/25, 11:15 AM
88. Narrow-line-mediated Sisyphus cooling in the 3P2 metastable state of strontium
Ryoto TAKEUCHI
2/18/25, 11:15 AM
71. Tasting proton decay
Akifumi CHITOSE
2/18/25, 11:15 AM
77. Tensor networks for quantum machine learning
Keisuke Murota
2/18/25, 11:15 AM
78. Bidirectional quantitative scattering microscopy
Kohki HORIE
2/18/25, 11:30 AM
83. Endomorphisms of von Neumann algebras and fusion categories
Kotaro KAWASUMI
2/18/25, 11:30 AM
89. Oligarchic growth of protoplanets in an expanding planetesimal ring
Yuki KAMBARA
2/18/25, 11:30 AM
72. Orbital polarization induced by chiral phonon excitations
Satoshi OMURA
2/18/25, 11:30 AM
90. Comprehensive Understanding of Cosmic Reionization History with JWST and Subaru
Hiroya UMEDA
2/18/25, 11:45 AM
73. Image restoration experiment for infrared data of Venusian clouds
Zhuan GUO
2/18/25, 11:45 AM
79. Numerical simulation of magnetic monopoles in topological magnets
Midori YAMADA
2/18/25, 11:45 AM
84. Probing neural activity driving animal movements
Takahisa DATE
2/18/25, 11:45 AM
74. Equivariant Poisson structures and module categories over representation categories
Mao HOSHINO
2/18/25, 12:00 PM
85. Investigating stellar element production in laboratory
Tik Tsun YEUNG
2/18/25, 12:00 PM
91. Search for Ultralight Axion Dark Matter with Optical Ring Cavity
Hiroki FUJIMOTO
2/18/25, 12:00 PM
80. Universal structure of nonequilibrium thermodynamics
Kohei YOSHIMURA
2/18/25, 12:00 PM
92. Log-rank test with nonparametric matching
Tomoya BABA
2/18/25, 12:15 PM
86. TBA
Jun AKITA
2/18/25, 12:15 PM
75. Uniqueness of the non-equilibrium steady state in open quantum many-body systems
Hironobu YOSHIDA
2/18/25, 12:15 PM
10. Quantum Theory and Mathematics
Prof. Christoph Schweigert (University of Hamburg)
2/18/25, 2:00 PM
11. Optical Quantum Computers with Quantum Teleportation
Prof. Akira Furusawa (School of Engineering, UTokyo)
2/18/25, 2:30 PM
19. My Research Career in Japan and Germany
Dr Yuya Morimoto (RIKEN/School of Engineering, UTokyo)
2/18/25, 3:00 PM
115. 1. Utilizing backconversion for highly efficient and stable wavelength conversion from Yb:KGW femtosecond laser
Kota AIKYO
2/18/25, 4:00 PM
116. 2. Photoelectron spectroscopy of thiolate-protected gold cluster anions formed by matrix-assisted laser desorption/ionization
Koumei AKAZAWA
2/18/25, 4:01 PM
117. 3. Revisiting the Role of Zero Modes around Solitons
Takafumi AOKI
2/18/25, 4:02 PM
118. 4. TBA
Tatsuya AONASHI
2/18/25, 4:03 PM
119. 5. Direct observation of valence electron density in intermetallic compounds
Shungo AOYAGI
2/18/25, 4:04 PM
120. 6. CNN method for the charged-current electron neutrino cross-sections measurement at T2K near detector
Tomochika ARAI
2/18/25, 4:05 PM
121. 7. Can supermassive stars be a Nitrogen origin of GN-z11?
Sho EBIHARA
2/18/25, 4:06 PM
122. 8. Revealing the Energy Distribution of shocks in RCW 86 NE with XRISM and NuSTAR
Gen FUJIMOTO
2/18/25, 4:07 PM
123. 9. Quantum Breakdown Model: the Exact Solution and Dynamics
Xinye GUAN
2/18/25, 4:08 PM
124. 10. Discrete geometry of 3-dimensional Spin Manifold
Akira HARADA
2/18/25, 4:09 PM
125. 11. Universal Upper Bound on Work Extractable from Quantum Many-Body Systems
Akihiro HOKKYO
2/18/25, 4:10 PM
126. 12. TBA
Kensuke HONDA
2/18/25, 4:11 PM
127. 13. Entanglement swapping in critical quantum spin chains
Masahiro HOSHINO
2/18/25, 4:12 PM
128. 14. A categorical approach to Gödel's incompleteness via arithmetic universes
Yuto IKEDA
2/18/25, 4:13 PM
129. 15. Research on how to implement repeat-until-success nonlinear optical quantum gate circuits
Shion IKEHARA
2/18/25, 4:14 PM
130. 16. Parallel Gradient Estimation of Parameterized Quantum Circuit
Soichiro IMAMURA
2/18/25, 4:15 PM
131. 17. Frequency collision analysis of all-microwave two-qubit gate
Shinichi INOUE
2/18/25, 4:16 PM
132. 18. Mechanism of nuclear condensate miscibility
Shoma INOUE
2/18/25, 4:17 PM
133. 19. Quantum i.i.d. Steady States in Open Quantum Many-Body Systems
Takanao ISHII
2/18/25, 4:18 PM
134. 20. Insights into Confinement in Supersymmetric Gauge Theories
Riku ISHIKAWA
2/18/25, 4:19 PM
135. 21. Analysis of the nonlinear transport prooperties on the one-dimensional Hubbard model
Tetsuya IWASAKI
2/18/25, 4:20 PM
136. 22. Tracing Cosmic Reionization: Lyα Emission from Early Galaxies Observed with JWST
Yuta KAGEURA
2/18/25, 4:21 PM
137. 23. Angular Momentum Transfer from a Vortex Beam to a Superconductor
Daemo KANG
2/18/25, 4:22 PM
138. 24. Graphical representation of a stationary distribution and static responses in population dynamics
Koya KATAYAMA
2/18/25, 4:23 PM
139. 25. Indirect search for dark matter using radio observations
Chikara KAWAI
2/18/25, 4:24 PM
140. 26. Jet propagation in aspherical ejecta from neutron star-black hole merger
Daisaburo KIDO
2/18/25, 4:25 PM
141. 27. Skeletaly fused reversible Michael acceptor for the virus desease treatment
YUHI KOBAYASHI
2/18/25, 4:26 PM
142. 28. TAO 6.5m telescope high-speed observation unit for unveiling Fast Radio Bursts origins
Emon KODAMA
2/18/25, 4:27 PM
143. 29. A constructive proof of the general Nullstellensatz
Ryota KUROKI
2/18/25, 4:28 PM
144. 30. Simulation of Oxygen Green Aurora Emission on Venus
Pucheng LU
2/18/25, 4:29 PM
146. 31. Simulation study of ultra-slow muon generation for the J-PARC Muon g-2/EDM Experiment
Meng LYU
2/18/25, 4:30 PM
147. 32. Decoherence suppression of optical non-Gaussian quantum states using a loop-based optical circuit
Akihiro MACHINAGA
2/18/25, 4:31 PM
148. 33. Rigorous lower bound on dynamical critical exponents of critical frustration-free systems
Rintaro MASAOKA
2/18/25, 4:32 PM
149. 34. Tensor cross interpolation approach for quantum impurity problems based on the weak-coupling expansion
Shuta MATSUURA
2/18/25, 4:33 PM
150. 35. TBA
Yuta MIKI
2/18/25, 4:34 PM
151. 36. A model for periodic patterning of tracheal cartilage rings
Masahito MORI
2/18/25, 4:35 PM
152. 37. Electronic structure of dimers of gold nanoclusters probed by gas-phase photoelectron spectroscopy
Yosuke NAKASHIMA
2/18/25, 4:36 PM
153. 38. Classification of theories and the notion of independence
Koitaro NAKAURA
2/18/25, 4:37 PM
154. 39. Undulator radiation interferometry for electron beam energy measurement
Koutarou NISHI
2/18/25, 4:38 PM
155. 40. Selective synthesis of aromatic hydrocarbon macrocycles with partially functionalized structures
Hideaki NISHINA
2/18/25, 4:39 PM
156. 41. Stabilization of the Molecular Crystal Composite Electrolyte - LiCoO2 Potitive Electrolyte Interface by Introducing a Protective Layer
Tomoaki OKOCHI
2/18/25, 4:40 PM
157. 42. Langlands program and its application to number theory
Haruto OONISHI
2/18/25, 4:41 PM
158. 43. Dimension of the Hilbert space and time-reversal anomaly in bosonic TQFT
Ippo ORII
2/18/25, 4:42 PM
159. 44. Long-term heat-storage material based on novel metastable ceramics λ-Ti3O5
Tomu OTAKE
2/18/25, 4:43 PM
160. 45. Quantum-Classical correspondence for monitored quantum dynamics
Atsushi OYAIZU
2/18/25, 4:44 PM
161. 46. Real-space observation of aging structures in colloidal gels
Shunichi SAITO
2/18/25, 4:45 PM
162. 47. Gauge Theory and Generalized Cohomology
Shota SAITO
2/18/25, 4:46 PM
163. 48. Harmonic measures in invariant random graphs on Gromov hyperbolic spaces
Kohki SAKAMOTO
2/18/25, 4:47 PM
164. 49. Representation theory of quantum groups
Heizo SAKAMOTO
2/18/25, 4:48 PM
165. 50. Development of non-covalent chemigenetic Ca2+ indicator
Kenryo SAKOI
2/18/25, 4:49 PM
166. 51. CMB polarimetry using a polarization modulator to probe cosmic inflation
Daichi SASAKI
2/18/25, 4:50 PM
167. 52. Towards the Universal Theory Behind Species-Specific Difference in Cellular Dedifferentiation Potential
Kansuke SASAMORI
2/18/25, 4:51 PM
168. 53. Developing a Transient Event Alert System for the Tomo-e Gozen Wide-Field Survey
Taiga SASAOKA
2/18/25, 4:52 PM
169. 54. Thermal Regulation of Protein Secretion Using Thermo-responsive Proteins
Takahiro SATO
2/18/25, 4:53 PM
170. 55. Introduction to Interacting Particle Systems
Tomo SATO
2/18/25, 4:54 PM
171. 56. Imaging stress distribution under high pressure using diamond quantum sensors
Ryotaro SUDA
2/18/25, 4:55 PM
172. 57. Label-free microscopy technologies
Yusei SUGAWARA
2/18/25, 4:56 PM
173. 58. Demonstration of THz-bandwidth all-optical quantum teleportation
Takumi SUZUKI
2/18/25, 4:57 PM
174. 59. Cuntz's picture of equivariant KK theory
Yusuke SUZUKI
2/18/25, 4:58 PM
175. 60. The effect of optimal self-distillation in noisy gaussian mixture model
Kaito TAKANAMI
2/18/25, 4:59 PM
176. 61. Relations between supermassive black holes and galaxies over cosmic history revealed by JWST
Takumi TANAKA
2/18/25, 5:00 PM
177. 62. Microscopic theory of the inverse Faraday effect in a multiorbital model
Kosuke TAZUKE
2/18/25, 5:01 PM
178. 63. An accurate estimator for galaxy-galaxy weak lensing power spectrum
Taisei TERAWAKI
2/18/25, 5:02 PM
179. 64. Noise-robust algorithm for real-space dynamics on quantum computers
Kazuki TSUOKA
2/18/25, 5:03 PM
180. 65. Edge State of Bacterial Collective Motion Rectified by Asymmetric Channels
Yoshihito UCHIDA
2/18/25, 5:04 PM
181. 66. Photon polarization tensor at finite temperature and density in a magnetic field
Tomoya UJI
2/18/25, 5:05 PM
182. 67. Irradiation tolerace evaluation of DMAPS sensor for Belle II vertex detector upgrade
Shijie WANG
2/18/25, 5:06 PM
183. 68. Threefold Way for Typical Entanglement
Haruki YAGI
2/18/25, 5:07 PM
184. 69. Probing cosmic large scale structure with voids
Yuka YAMADA
2/18/25, 5:08 PM
185. 70. Pulse width dependence on Spin-Orbit Torque switching in an antiferromagnet Mn3Sn thin film
Shogo YAMADA
2/18/25, 5:09 PM
186. 71. Quasi-likelihood analysis for stochastic differential equation models
Shota YANO
2/18/25, 5:10 PM
187. 72. Elliptic Genus in Gauged Linear Sigma Model
Dongao ZHOU
2/18/25, 5:11 PM
12. Scalable Networking of Neutral-Atom Quantum Computers Using Nanofiber Cavities
Prof. Akihisa Goban (Nano QT (Nanofiber Quantum Technologies))
2/19/25, 9:30 AM
13. My 30-year Quest to Solve the Mysteries of Supermassive Black Holes
Prof. Luis C. Ho (Kavli Institute for Astronomy and Astrophysics, Peking University)
2/19/25, 10:00 AM
109. Continuous variable quantum key distribution
Shinichiro YAMANO
2/19/25, 11:00 AM
104. Observation of photocatalytic reaction by time-resolved in situ soft x-ray absorption spectroscopy
Kohei SHIBUYA
2/19/25, 11:00 AM
99. Search for sterile neutrino at the Belle II experiment
Tomoyuki SHIMASAKI
2/19/25, 11:00 AM
93. Theory of chirality-induced spin Seebeck effect
Naoki NISHIMURA
2/19/25, 11:00 AM
105. Binaries of White dwarfs and Main Sequence Stars in few-days orbit discovered by TESS and Gaia
Yuta SHIRAISHI
2/19/25, 11:15 AM
101. Generative Diffusion Model with Inverse Renormalization Group Flows
Kanta MASUKI
2/19/25, 11:15 AM
110. Measuring Gravitational Lensing Three-Point Statistics Unaffected by Observational Region Shape
Takanori TANIGUCHI
2/19/25, 11:15 AM
94. Polarization Signal Reduction Associated with Magnetic Reconnection Events in the Solar Chromosphere
Xinyu ZHOU
2/19/25, 11:15 AM
106. Observation of magnetism in 2D vdW crystals
Hao GU
2/19/25, 11:30 AM
102. Optical Quantum States Generation using a High-Speed Photon-Number-Resolving Detector
Kazuma TAKAHASHI
2/19/25, 11:30 AM
95. Spectral truncations, approximations in noncommutative geometry and some applications to machine learning
Ayoub HAFID
2/19/25, 11:30 AM
111. Study of magnetization-induced second harmonic generation
Toshihide SUMI
2/19/25, 11:30 AM
107. Population inference of binary black holes with effective spin parameters
Masaki IWAYA
2/19/25, 11:45 AM
112. Preliminary results of high-contrast observations of cool stars from the Subaru Intensive Survey on accelerating stars
Ziying GU
2/19/25, 11:45 AM
96. Terahertz third harmonic generation in the iron-based superconductor FeSe
Haruki MATSUMOTO
2/19/25, 11:45 AM
103. Ultra-broadband vibrational spectroscopy of buried interfaces
Risako KAMEYAMA
2/19/25, 11:45 AM
108. All-Gaussian Quantum Neural Network
Hironari NAGAYOSHI
2/19/25, 12:00 PM
98. Automorphism groups of specific Calabi-Yau manifolds
Renji SAKAMOTO
2/19/25, 12:00 PM
100. Moonshine Phenomena and Symmetries of lattice CFTs
Masaki OKADA
2/19/25, 12:00 PM
113. Research and development towards an axion search experiment using quantum sensing of magnons
Yaman SINGH SHRESTHA
2/19/25, 12:00 PM
97. TBA
Ryuhoh IDE
2/19/25, 12:15 PM
114. TBA
Muzi HONG
2/19/25, 12:15 PM
14. Scalable, Ultrafast Quantum Information Processors in Nanophotonics
Prof. Rajveer Nehra (University of Massachusetts Amherst)
2/19/25, 2:00 PM
15. Multifunctional Luminescent Materials Constructed from Molecules
Prof. Szymon Chorazy (Jagiellonian University)
2/19/25, 2:30 PM
20. Fujitsu Laboratories, Corporate Research, and the FoPM Program
Dr Takeru Fukuoka (Fujitsu)
2/19/25, 3:00 PM
16. Research Life at UC Berkeley: Sensing the dynamic universe with rockets and satellites
Dr Shunsaku Nagasawa (Space Sciences Laboratory, UC Berkeley)
2/19/25, 4:00 PM

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17. Researcher in a Chemical Company
Dr Hiroaki Tanaka (Research Center for Computational Science and Informatics, Resonac)
2/19/25, 4:15 PM
23. Summary / Closing
Prof. Hitoshi MURAYAMA (UC Berkeley / Kavli IPMU, UTokyo)
2/19/25, 5:30 PM
24. Optical response of edge modes in time-reversal symmetric topological superconductors
Hirokazu KOBAYASHI
145. Simulation of Oxygen Green Aurora Emission on Venus
Pucheng LU
22. Utilizing backconversion for highly efficient and stable wavelength conversion from Yb:KGW femtosecond laser
Kota AIKYO
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