Voltage control of the spin dynamics of an exciton in a semiconductor quantum dot

被引：141

作者：

Smith, JM ^{[1
]}

Dalgarno, PA

Warburton, RJ

Govorov, AO

Karrai, K

Gerardot, BD

Petroff, PM

机构：

[1] Heriot Watt Univ, Sch Engn & Phys Sci, Edinburgh EH14 4AS, Midlothian, Scotland

[2] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

[3] Univ Munich, Ctr NanoSci, D-80539 Munich, Germany

[4] Univ Munich, Dept Phys, D-80539 Munich, Germany

[5] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 19期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.94.197402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the observation of a spin-flip process in a quantum dot whereby a dark exciton with total angular momentum L=2 becomes a bright exciton with L=1. The spin-flip process is revealed in the decay dynamics following nongeminate excitation. We are able to control the spin-flip rate by more than an order of magnitude simply with a dc voltage. The spin-flip mechanism involves a spin exchange with the Fermi sea in the back contact of our device and corresponds to the high temperature Kondo regime. We use the Anderson Hamiltonian to calculate a spin-flip rate, and we find excellent agreement with the experimental results.

引用

页数：4

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