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kensuke[atmark]phys.sci.osaka-u.ac.jp
Recent progress in nanotechnology enables us to directly address quantum transport of electrons in nano-devices made of metal or semiconductor. For example, the wave nature of electrons can be controlled in electronic interferometers ("Aharonov-Bohm rings"), while their particle nature is accessible in quantum dots ("artificial atoms"). We can even combine these two kinds of devices into one, where the wave-particle duality in quantum mechanics manifests itself. The advantage of such research field, which is called "mesoscopic physics" or "nanophysics", lies in the controllability and the versatile degrees of freedom in the device design. We try to understand and control various novel quantum, many-body, and nonequilibrium effects in nano-devices from the dynamical aspects of electron transport.
1. To clarify and control various quantum, many-body, and nonequilibrium effects in solid state devices.
2. Development of measurement techniques to address dynamical aspects of electron transport.
Semiconductor quantum dot in the Kondo regime, where we perform an "on-chip collision experiment" to clarify how electrons are scattered by the correlated ground state.
S. Nakamura, Y. Yamauchi, M. Hashisaka, K. Chida, K. Kobayashi, T. Ono, R. Leturcq, K. Ensslin, K. Saito, Y. Utsumi, and A. C. Gossard, "Fluctuation Theorem and Microreversibility in a Quantum Coherent Conductor", Phys. Rev. B 83, 155431 (2011) [Editors' Suggestion].
Y. Yamauchi, K. Sekiguchi, K. Chida, T. Arakawa, S. Nakamura, K. Kobayashi, T. Ono, T. Fujii, R. Sakano, "Evolution of the Kondo effect in a quantum dot probed by shot noise", Phys. Rev. Lett. 106, 176601 (2011).
S. Nakamura, Y. Yamauchi, M. Hashisaka, K. Chida, K. Kobayashi, T. Ono, R. Leturcq, K. Ensslin, K. Saito, Y. Utsumi, and A. C. Gossard, "Nonequilibrium Fluctuation Relations in a Quantum Coherent Conductor", Phys. Rev. Lett. 104, 080602 (2010).
M. P. Delmo, S. Yamamoto, S. Kasai, T. Ono, and K. Kobayashi, "Large positive magnetoresistive effect in silicon induced by the space-charge effect", Nature 457, 1112 (2009).
M. Sato, H. Aikawa, K. Kobayashi, S. Katsumoto, and Y. Iye, "Observation of the Fano-Kondo Anti-Resonance in a Quantum Wire with a Side-Coupled Quantum Dot", Phys. Rev. Lett. 95, 066801 (2005).
K. Kobayashi, H. Aikawa, S. Katsumoto, and Y. Iye, "Tuning of the Fano Effect through a Quantum Dot in an Aharonov-Bohm Interferometer", Phys. Rev. Lett. 88, 256806 (2002).
[Academic career]
Degree received
B.S. from Department of Physics, University of Tokyo, 1994.
M.S. from Department of Physics, University of Tokyo, 1996.
Ph. D (Dr. Sc) from University of Tokyo, 1999.
[Work Experience]
April 1996 - April 1998
Research Fellow of the Japan Society for the Promotion of Science for Young Scientists
April 1998 - August 1999
Research Associate, Department of Physics, University of Tokyo
August 1999 - March 2005
Research Associate, Institute for Solid State Physics, University of Tokyo
April 2004 - March 2005
Researcher at Solid State Physics Laboratory, ETH Zurich
Aprril 2005 - March 2012
Associate Professor, Institute for Chemical Research, Kyoto University
April 2012 -
Professor, Graduate School of Science, Osaka University