Curriculum Vitaes
Profile Information
- Affiliation
- Professor, Faculty of Science and Technology, Department of Engineering and Applied Sciences, Sophia University
- Degree
- Doctor of Philosophy(The University of Tokyo)理学修士(東京大学)理学博士(東京大学)
- Researcher number
- 50201976
- J-GLOBAL ID
- 200901008827204586
- researchmap Member ID
- 1000082891
- External link
I took ph.D on the quantum Hall effect at Univ. Tokyo.
I studied numerical scaling methods while working at PTB Germany as a post doctral fellow.
I developed scaling of the level statistics at Osaka and Toho universities.
After moving to Sophia University, I have been studing the localization and conductance scaling properties. The main focus of recent research is on the topological insulators and superconductors.
Tomi Ohtsuki, Doctor of Science (University of Tokyo, 1989), is Professor of physics at Sophia University, Tokyo, where he conducts theoretical and computational researches in condensed matter physics. His recent research focuses on quantum transport phenomena such as the Anderson transition, conductance fluctuations, Hall and spin Hall effects in nanoscale systems. He has taught physics for more than 15 years in several universities and graduate schools. His research has been published by Physical Review Letters, Physical Review B, Physics Reports, and others.
The main classes he has are mechanics, electromagnetics, linear algebra, statistical physics as well as solid state physics.
(Subject of research)
Numerical Study of Anderson transitions
spin related quantum transport phenomena
Research Interests
7Research Areas
1Awards
8Papers
208-
Physical Review B - Condensed Matter and Materials Physics, 92(23) 235407, Dec 3, 2015 Peer-reviewed
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PHYSICAL REVIEW B, 92(23), Dec, 2015 Peer-reviewed
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PHYSICAL REVIEW APPLIED, 3(6) 064006-1-064006-7, Jun, 2015 Peer-reviewed
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SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, 16(1) 14403, Feb, 2015 Peer-reviewedInvited
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Meeting Abstracts of the Physical Society of Japan, 70 1137-1137, 2015
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Meeting Abstracts of the Physical Society of Japan, 70 1142-1142, 2015
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Meeting Abstracts of the Physical Society of Japan, 70 1105-1105, 2015
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20TH INTERNATIONAL CONFERENCE ON MAGNETISM, ICM 2015, 75 100-105, 2015 Peer-reviewed
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Meeting Abstracts of the Physical Society of Japan, 70 1396-1396, 2015
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Meeting Abstracts of the Physical Society of Japan, 70 1271-1271, 2015
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Meeting Abstracts of the Physical Society of Japan, 70 1276-1276, 2015
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Meeting Abstracts of the Physical Society of Japan, 70 1275-1275, 2015
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JAPANESE JOURNAL OF APPLIED PHYSICS, 53(3) 030301, Mar, 2014 Peer-reviewed
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PHYSICAL REVIEW LETTERS, 112(1) 016402-016402, Jan, 2014 Peer-reviewed
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Critical exponent for the Anderson transition in the three-dimensional orthogonal universality classNEW JOURNAL OF PHYSICS, 16(1) 015012-015012, Jan, 2014 Peer-reviewedInvited
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Physical Review B - Condensed Matter and Materials Physics, 88(15) 155438-1-245438-6, Oct 28, 2013 Peer-reviewed
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PHYSICAL REVIEW B, 88(15), Oct, 2013 Peer-reviewed
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Physical Review Letters, 110(23) 236803, Jun 5, 2013
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PHYSICAL REVIEW LETTERS, 110(23), Jun, 2013 Peer-reviewed
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Optics InfoBase Conference Papers, 2013
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PHYSICS OF SEMICONDUCTORS, 1566 548-+, 2013 Peer-reviewed
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LOCALISATION 2011: PROCEEDINGS OF THE SATELLITE CONFERENCE OF LT 26, 11 114-119, 2013
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Physical Review B - Condensed Matter and Materials Physics, 86(24) 245436, Dec 28, 2012
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PHYSICAL REVIEW B, 86(24), Dec, 2012 Peer-reviewed
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Soryushiron Kenkyu Electronics, 119(4) D192-D201, 2012The Anderson transition is a disorder driven quantum phase transition between metallic and insulating phases. In contrast to the common belief that two dimensional (2D) systems are always insulating and that the Anderson transition does not occur in 2D, in certain universality classes 2D systems can be metallic. We review the recent development of the theory of the Anderson transition in 2D. There are ten universality classes: three Wigner-Dyson classes, three chiral universality classes, and four Bogoliubov-de Gennes classes. We report results for critical exponents and distributions of conductance for the symplectic universality class. We emphasize that, on the one hand, the existence of a topological insulating phase does not alter the value of the critical exponent, while on the other, it strongly affects the form of the conductance distribution at the transition.
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International Journal of Modern Physics Conference Series, 11 60--69, Jan 1, 2012In Ref. 1, we reported an estimate of the critical exponent for the divergence of the localization length at the quantum Hall transition that is significantly larger than those reported in the previous published work of other authors. In this paper, we update our finite size scaling analysis of the Chalker-Coddington model and suggest the origin of the previous underestimate by other authors. We also compare our results with the predictions of Lütken and Ross.2
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RIMS Kokyuroku Bessatsu, 27 141-147, Jul, 2011
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2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011, 2011 Peer-reviewed
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2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011, 2011 Peer-reviewed
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PHOTONIC AND PHONONIC PROPERTIES OF ENGINEERED NANOSTRUCTURES, 7946, 2011
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PHYSICAL REVIEW B, 82(20) 205328, Nov, 2010
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PHYSICAL REVIEW B, 82(16) 165301, Oct, 2010
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INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 24(12-13) 1841-1854, May, 2010
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THIRD INTERNATIONAL WORKSHOP ON THEORETICAL AND COMPUTATIONAL NANOPHOTONICS - TACONA-PHOTONICS 2010, 1291 118-+, 2010 Peer-reviewed
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ULTRAFAST PHENOMENA IN SEMICONDUCTORS AND NANOSTRUCTURE MATERIALS XIV, 7600 76001B, 2010 Peer-reviewed
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JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 78(8) 084708-084708-5, Aug, 2009
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Journal of the Physical Society of Japan, 78(8) 084708-084708-5, Jul 27, 2009We study the transport properties of disordered two-dimensional electron systems with a perfectly conducting channel. We introduce an asymmetric Chalker–Coddington network model and numerically investigate the point-contact conductance. We find that the behavior of the conductance in this model is completely different from that in the symmetric model. Even in the limit of a large distance between the contacts, we find a broad distribution of conductance and a non-trivial power law dependence of the averaged conductance on the system width. Our results are applicable to systems such as zigzag graphene nano-ribbons where the numbers of left- and right-going channels are different.
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PHYSICAL REVIEW B, 80(4) 041304-1-041304-4, Jul, 2009
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16TH INTERNATIONAL CONFERENCE ON ELECTRON DYNAMICS IN SEMICONDUCTORS, OPTOELECTRONICS AND NANOSTRUCTURES (EDISON 16), 193, 2009 Peer-reviewed
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25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 2, 150, 2009
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PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 40(5) 1677-1680, Mar, 2008
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PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 40(5) 1072-1074, Mar, 2008
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Physica Status Solidi (B) Basic Research, 245(2) 393-408, Feb, 2008
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PHYSICAL REVIEW B, 75(23) 235317-1-235317-5, Jun, 2007
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PHYSICAL REVIEW B, 75(24) 245313-1-245313-5, Jun, 2007
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PHYSICS OF SEMICONDUCTORS, PTS A AND B, 893 1263-+, 2007 Peer-reviewed
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PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 34(1-2) 228-231, Aug, 2006 Peer-reviewed
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PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 34(1-2) 104-107, Aug, 2006 Peer-reviewed
Misc.
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53(8) 447-454, Aug 15, 2018 Peer-reviewedInvitedWe review the new method of obtaining the phase diagrams of quantum phase transitions in random electron systems. The method is based on the image recognition using the multilayer convolutional neural network, deep learning. Applications to the Anderson transition as well as quantum percolations are demonstrated.
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人工知能, 33(4) 429-434, Jun 21, 2018 Peer-reviewedInvitedニューラルネットワークを使った物性物理学の現状を解説した。
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RIMS Kokyuroku, 1970 90-95, Nov, 2015
Books and Other Publications
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朝倉書店, Oct 10, 2019 (ISBN: 9784254131291)機械学習を使って物理学で何ができるのかを解説した著書。大槻・真野の分担は機械学習，深層学習が物理に何を起こそうとしているかを波動関数の解析を例に解説した，第1章である。
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Wiley-Scrivener, Apr 9, 2019 (ISBN: 9781119407294)Topological properties are sometimes emergent or enforced by the breaking of translational invariance. Here, in this chapter we discuss dimensional crossover of topological properties in thin films of topological insulators (TI) and Weyl semi- metals, electronic properties on the surface of TI nanoparticles and TI nanowires as a constrained electronic system. To discuss the effects of disorder is another highlight of this chapter. We cast on the unusual robustness of Dirac and Weyl semimetal phases against disorder, then the discussion is turned to a novel type of quantum criticality emergent from this unusual robustness, leading us to formu- late the scaling theory of semimetal-metal transition. The concept of topological matter dose not fade under circumstances of absent translational invariance; it is on the contrary, emergent or enforced under such circumstances.
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Wiley online library, Mar 12, 2019 (ISBN: 9781119407317)
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Oxford University Press, Jul 18, 2012 (ISBN: 9780199592593)
Professional Memberships
2Research Projects
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Grants-in-Aid for Scientific Research Grant-in-Aid for Transformative Research Areas (A), Japan Society for the Promotion of Science, Jun, 2022 - Mar, 2027
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Grants-in-Aid for Scientific Research Grant-in-Aid for Transformative Research Areas (A), Japan Society for the Promotion of Science, Jun, 2022 - Mar, 2027
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科学研究費助成事業, 日本学術振興会, Apr, 2021 - Mar, 2026
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科学研究費助成事業 基盤研究(B), 日本学術振興会, Apr, 2021 - Mar, 2026
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Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Japan Society for the Promotion of Science, Apr, 2019 - Mar, 2024
Other
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Oct, 2005 - Mar, 2008As the head of the curriculum committee for English for science and engineering program, I have organized more than 30 classes, and prepared electronic lecture materials. I also taught physics classes myself using DVD and other electronic lecture materials.
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Apr, 1998 - Sep, 2007ナノスケールの物理学に関する講義ノートを電子化し，学生に配付した。これにより学生は予習，復習を容易に行えるようになった。さらに細かい記法と複雑な式を正確に学べるようになった。
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Apr, 1999 - Sep, 2001物理学を学ぶ上で必要な数学と，それをふまえた体系的な力学を講義ノートを電子化して教授した。学生は詳しい講義ノートをダウンロード，印刷することで内容に集中できるようになった。