2013 Fiscal Year Final Research Report
Effect of the measurement circuit on the fluctuation theorem for the electric current through a semiconducting nanostructure
| Project/Area Number |
23740294
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Mathematical physics/Fundamental condensed matter physics
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| Research Institution | Mie University |
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Principal Investigator |
UTSUMI Yasuhiro 三重大学, 工学(系)研究科(研究院), 准教授 (10415094)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 非平衡・非線形物理学 / メゾスコピック量子輸送 / 半導体ナノ構造 |
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| Research Abstract |
The fluctuation theorem (FT) which is valid far from equilibrium and extends the second law of thermodynamics to small systems, has been recently applied to the mesoscopic quantum transport. We have theoretically studied the impact of the measurement circuit on the FT of quantum conductors. 1) We have considered the FT for a coupled system, an electron wave interferometer and an LC circuit (measurement circuit), and found that the back-action of the measurement circuit is necessary to be consistent with the FT for this setup. 2) We theoretically derived and experimentally checked universal relations among nonlinear 4-terminal transport coefficients of a coupled system, a double-quantum dot and a quantum point contact (measurement circuit). 3) We have also found a novel switching exponent for the magnetization reversal driven by the non-conservative spin torque and thermal fluctuations.
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[Presentation] Fluctuation theorem in the single-electron transport2013
Author(s)
Y. Utsumi
Organizer
East Asia Joint Seminars on Statistical Physics in cooperation with the JSPS Core-to-Core program, Non-equilibrium dynamics of soft mater and information
Place of Presentation
Yukawa Institute for Theoretical Physics, Kyoto Japan
Year and Date
20131021-24
Invited
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[Presentation] Fluctuation Theorem and Single-Electron Tunneling2012
Author(s)
Gerd Schon, Yasuhiro Utsumi, Dmitry Golubev, Michael Marthaler
Organizer
Quantum Noise and Measurement in Engineered Electronic Systems
Place of Presentation
Max-Planck Institute for the Physics of Complex systems, Dresden, Germany
Year and Date
20121008-12
Invited
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