Spin dynamics from Majorana fermions
强关联电子
2009-11-10 v3
摘要
Using the Majorana fermion representation of spin-1/2 local moments, we show how it is possible to directly read off the dynamic spin correlation and susceptibility from the one-particle propagator of the Majorana fermion. We illustrate our method by applying it to the spin dynamics of a non-equilibrium quantum dot, computing the voltage-dependent spin relaxation rate and showing that, at weak coupling, the fluctuation-dissipation relation for the spin of a quantum dot is voltage-dependent. We confirm the voltage-dependent Curie susceptibility recently found by Parcollet and Hooley [Phys. Rev. B {\bf 66}, 085315 (2002)].
引用
@article{arxiv.cond-mat/0305001,
title = {Spin dynamics from Majorana fermions},
author = {W. Mao and P. Coleman and C. Hooley and D. Langreth},
journal= {arXiv preprint arXiv:cond-mat/0305001},
year = {2009}
}
备注
Small modifications added to figure and text