Quantum versus classical hyperfine-induced dynamics in a quantum dot

被引：32

作者：

Coish, W. A.

Loss, Daniel

Yuzbashyan, E. A.

Altshuler, B. L.

机构：

[1] Univ Basel, Dept Phys & Astron, CH-4056 Basel, Switzerland

[2] Rutgers State Univ, Ctr Mat Theory, Dept Phys & Astron, Piscataway, NJ 08854 USA

[3] Columbia Univ, Dept Phys, New York, NY 10027 USA

[4] NEC Labs Amer, Princeton, NJ 08540 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2007年 / 101卷 / 08期

基金：

日本科学技术振兴机构; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1063/1.2722783

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this article we analyze spin dynamics for electrons confined to semiconductor quantum dots due to the contact hyperfine interaction. We compare mean-field (classical) evolution of an electron spin in the presence of a nuclear field with the exact quantum evolution for the special case of uniform hyperfine coupling constants. We find that (in this special case) the zero-magnetic-field dynamics due to the mean-field approximation and quantum evolution are similar. However, in a finite magnetic field, the quantum and classical solutions agree only up to a certain time scale t <tau(c), after which they differ markedly.

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页数：5

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