Double-dot charge qubit and transport via dissipative cotunneling

被引：16

作者：

Li, MR ^{[1
]}

Le Hur, K ^{[1
]}

机构：

[1] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 17期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.93.176802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate transport through an exotic charge qubit composed of two strongly capacitively coupled quantum dots, each being independently connected to a side gate which in general exhibits a fluctuating electrostatic field (i.e., Johnson-Nyquist noise). Two quantum phases are found: the "Kondo" phase where an orbital-Kondo entanglement emerges and a "local moment" phase in which the noise destroys the Kondo effect leaving the orbital spin unscreened and resulting in a clear suppression of the conductance. In the Kondo realm, the transfer of charge across the setting is accompanied by zero-point charge fluctuations in the two dissipative environments and then the I-V characteristics are governed by what we call "dissipative cotunneling."

引用

页码：176802 / 1

页数：4

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