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题名: Time-dependent electron tunnelling through a quantum dot with Coulomb interactions
作者: Sun, QF ;  Lin, TH
刊名: JOURNAL OF PHYSICS-CONDENSED MATTER
出版日期: 1997
卷号: 9, 期号:23, 页码:4875-4886
关键词: CONDUCTANCE ;  TRANSPORT ;  MODEL
学科分类: Physics
通讯作者: Sun, QF , BEIJING UNIV,DEPT PHYS,MESOSCOP PHYS LAB,BEIJING 100871,PEOPLES R CHINA.
部门归属: CCAST,WORLD LAB,BEIJING 100080,PEOPLES R CHINA; ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
英文摘要: Keldysh's nonequilibrium Green function is used to study the electron tunnelling through a quantum dot. Two kinds of intra-dot electron-electron (e-e) interaction are introduced: U-n for the interaction at the same energy level n with different spins, and V-n sigma,V-m sigma' for the interaction between different levels n and m. General formulas of the time-varying current j(t) and the averaged current (j(t)) are derived when the external fields are applied to the system. In the time-independent linear response regime, our calculation demonstrates that the interval of the Coulomb oscillation peaks is mainly determined by V-n sigma,V-m sigma' which is always smaller than U-n. When the external microwave (MW) fields are applied to the system, we obtain: (1) The j(t) may become negative for a certain period of time, even if the chemical potential mu(L)(t) is larger than mu(R)(t) all the time. (2) The calculated structure of the Coulomb oscillation peaks (in asymmetric MW fields) is in good agreement with the experimental results of Kouwenhoven et al. (3) For the symmetric MW field case, our theoretical results are well consistent with the experiments of Blick et al and Drexler et al.
收录类别: SCI
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12470
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. Time-dependent electron tunnelling through a quantum dot with Coulomb interactions[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,1997,9(23):4875-4886.
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