Exponential decay in a spin bath

被引：68

作者：

Coish, W. A. ^{[1
,2
,3
]}

Fischer, Jan ^{[3
]}

Loss, Daniel ^{[3
]}

机构：

[1] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada

[2] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[3] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.77.125329

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We show that the coherence of an electron spin interacting with a bath of nuclear spins can exhibit a well-defined purely exponential decay for special ("narrowed") bath initial conditions in the presence of a strong applied magnetic field. This is in contrast to the typical case, where spin-bath dynamics have been investigated in the non-Markovian limit, giving superexponential or power-law decay of correlation functions. We calculate the relevant decoherence time T-2 explicitly for free-induction decay and find a simple expression with dependence on bath polarization, magnetic field, shape of the electron wave function, dimensionality, total nuclear spin I, and isotopic concentration for experimentally relevant heteronuclear-spin systems.

引用

页数：8