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题名: Transient current through a quantum dot with two time-dependent barriers
作者: Sun, QF ;  Lin, TH
刊名: JOURNAL OF PHYSICS-CONDENSED MATTER
出版日期: 1997
卷号: 9, 期号:14, 页码:3043-3053
关键词: TRANSPORT ;  DEVICE ;  MODEL
学科分类: Physics
部门归属: BEIJING UNIV,DEPT PHYS,BEIJING 100871,PEOPLES R CHINA; CCAST,WORLD LAB,BEIJING 100080,PEOPLES R CHINA; ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
英文摘要: We investigate the transient-current characteristics of a quantum dot coupled to two leads through two time-dependent barriers. A general formula for the time-dependent current j(t) is derived by using the nonequilibrium-Green-function technique. Two particular cases, those of rectangular-pulse modulations and harmonic modulations imposed on the two barriers, are studied in detail. For the rectangular-pulse modulations, a turnstile effect is obtained if the full width of the resonant state (Gamma) is much larger than the frequency (omega), i.e. Gamma much less than omega; and the special behaviour of the transient current j(t) is attributed to the phase coherence due to the time variation of the barriers. For the harmonic modulations, we find that a new energy scale Aw emerges if Gamma < omega, and the main resonant peak is split into two peaks.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:A1997WT34200018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12492
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Sun, QF,Lin, TH. Transient current through a quantum dot with two time-dependent barriers[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,1997,9(14):3043-3053.
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