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 |
Research Field |
Mathematical physics/Fundamental condensed matter physics
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Research Institution | Mie University |
Principal Investigator |
UTSUMI Yasuhiro 三重大学, 工学(系)研究科(研究院), 准教授 (10415094)
|
Project Period (FY) |
2011 – 2013
|
Project Status |
Completed (Fiscal Year 2013)
|
Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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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 / メゾスコピック系 / 量子輸送 / 国際情報交換 ドイツ |
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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Report
(4 results)
Research Products
(36 results)