標題: Nonadiabatic quantum pumping in mesoscopic nanostructures
作者: Tang, CS
Chu, CS
電子物理學系
Department of Electrophysics
關鍵字: nanostructures;nonadiabatic behaviour;quantum transport
公開日期: 2001
摘要: We consider a nonadiabatic quantum pumping phenomenon in a ballistic narrow constriction. The pumping is induced by a potential that has both spatial and temporal periodicity characterized by K and Omega. In the zero frequency (Omega = 0) limit, the transmission through narrow constriction exhibits valley structures due to the opening up of energy gaps in the pumping region - a consequence of the K periodicity. These valley structures remain robust in the regime of finite Omega, while their energies of occurrence are shifted by about h Omega /2. The direction of these energy shifts depend on the directions of both the phase-velocity of the pumping potential and the transmitting electrons. This frequency dependent feature of the valley structures gives rise to both the asymmetry in the transmission coefficients and tho pumping current. An experimental setup is suggested for a possible observation of our nonadiabatic quantum pumping finding. (C) 2001 Published by Elsevier Science Ltd.
URI: http://hdl.handle.net/11536/29981
http://dx.doi.org/10.1016/S0038-1098(01)00419-7
ISSN: 0038-1098
DOI: 10.1016/S0038-1098(01)00419-7
期刊: SOLID STATE COMMUNICATIONS
Volume: 120
Issue: 9-10
起始頁: 353
結束頁: 357
顯示於類別:期刊論文


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