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Time-dependent electron tunnelling through a quantum dot with Coulomb interactions
Sun, QF; Lin, TH; Sun, QF , BEIJING UNIV,DEPT PHYS,MESOSCOP PHYS LAB,BEIJING 100871,PEOPLES R CHINA.
1997
发表期刊JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN0953-8984
卷号9期号:23页码:4875-4886
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.
部门归属CCAST,WORLD LAB,BEIJING 100080,PEOPLES R CHINA; ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
关键词Conductance Transport Model
学科领域Physics
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收录类别SCI
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12470
专题理论物理所SCI论文
通讯作者Sun, QF , BEIJING UNIV,DEPT PHYS,MESOSCOP PHYS LAB,BEIJING 100871,PEOPLES R CHINA.
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GB/T 7714
Sun, QF,Lin, TH,Sun, QF , BEIJING UNIV,DEPT PHYS,MESOSCOP PHYS LAB,BEIJING 100871,PEOPLES R CHINA.. Time-dependent electron tunnelling through a quantum dot with Coulomb interactions[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,1997,9(23):4875-4886.
APA Sun, QF,Lin, TH,&Sun, QF , BEIJING UNIV,DEPT PHYS,MESOSCOP PHYS LAB,BEIJING 100871,PEOPLES R CHINA..(1997).Time-dependent electron tunnelling through a quantum dot with Coulomb interactions.JOURNAL OF PHYSICS-CONDENSED MATTER,9(23),4875-4886.
MLA Sun, QF,et al."Time-dependent electron tunnelling through a quantum dot with Coulomb interactions".JOURNAL OF PHYSICS-CONDENSED MATTER 9.23(1997):4875-4886.
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