Coulomb drag in parallel quantum dots

被引：20
|
作者：
Moldoveanu, V. [1 ]
Tanatar, B. [2 ]
机构：
[1] Natl Inst Mat Phys, POB MG-7, Bucharest 077125, Romania
[2] Bilkent Univ, Dept Phys, TR-06800 Ankara, Turkey
来源：
EPL | 2009年 / 86卷 / 06期
关键词：
MESOSCOPIC FLUCTUATIONS;
D O I：
10.1209/0295-5075/86/67004
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study theoretically the electronic transport in parallel few-level quantum dots in the presence of both intradot and interdot long-range Coulomb interaction. Each dot is connected to two leads and the steady-state currents are calculated within the Keldysh formalism using the random-phase approximation for the interacting Green functions. Due to the momentum transfer between the two systems it is possible to get a nonvanishing current through an unbiased Coulomb-blockaded dot, if the other dot is set in the nonlinear transport regime. The transitions between the levels of the passive dot reduce the drag current and lead to negative differential conductance. We also discuss the dependence on temperature and the role of the lead-dot coupling. Copyright (C) EPLA, 2009
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页数：6
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