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第５回ＣＯＥ(自己組織系物理)ワークショップ ［通算第11回］
| メゾスコッピク系に関するミニ研究会 |
| 日 時 |
2004年12月13日(月) 11:00-15:00 |
| 場 所 |
早稲田大学理工学部 〒169-8555 新宿区大久保3-4-1[地図] |
| 会 場 |
51号館2階第一会議室 |
| 講 師 |
Baowen Li （シンガポール国立大学物理学科、助教授）
Sang Wook Kim （釜山国立大学物理教育学科、助教授） |
| 紹介教員 |
田崎秀一 |
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| [プログラム] |
| 11:00−12:30 |
Baowen Li （シンガポール国立大学物理学科、助教授）
「Thermal diode and thermal transistor: controlling heat flow through nonlinear dynamics」
The invention of semiconductor transistor and its relevant devices that control the charge flow has revolutionized our daily life in every aspect. However, over half century has been past, similar devices for controlling heat flow are still lacking.
In this talk, I will give a detailed discussion about our recent invention of thermal diode and thermal transistor, the two devices for controlling heat flow. Emphasis will be given on the physical principle/mechanism of these two devices.
The thermal diode is a one way road for heat flow [1]. It allows the heat flow from one direction, while it prohibit heat flow for the another one.
Like the electronic counterpart, the thermal transistor [2] is a three-terminal device with the important feature that the current through the
two terminals can be controlled by small changes we make in the current or temperature at the third terminal. This control feature allows us to
amplify the small current or to switch the device from an “off” (insulating) state to an “on” (conducting) state.
The work is supported by FRG of NUS and the Temasek Young Investigator Award of DSTA Singapore and NUS.
Refs.
[1] B Li, L Wang and G Casati, “Thermal diode: Rectification of heat flux”, Phys. Rev. Lett 93, 184301 (2004)
[2] B Li, L Wang and G Casati, “Negative differential thermal resistance and thermal transistor” cond-mat/0410172
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| − Lunch − |
| 13:30−15:00 |
Sang Wook Kim （釜山国立大学物理教育学科、助教授）
「Floquet formalism of quantum pump」
The quantum pump is a device that generates a dc current at zero
bias potential through cyclic change of system parameters. Recently,
adiabatic charge pumping in open quantum dots not only has attracted
considerable theoretical attention but was also experimentally
realized by Switkes et al. I will present a Floquet formalism of
the quantum pump, which allows us to go beyond adiabatic limit.
Other issues related to Pauli blocking factors and magnetic field
inversion symmetry will be also discussed.
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