Spin transport in antiferromagnets in one and two dimensions calculated using the Kubo formula

被引：57

作者：

Pires, A. S. T. ^{[1
]}

Lima, L. S. ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 06期

关键词：

antiferromagnetic materials; ballistic transport; Heisenberg model; NONLINEAR SIGMA-MODEL; LOW-TEMPERATURE; WAVE THEORY; HEISENBERG-ANTIFERROMAGNET; DYNAMICS; SYSTEMS; S=1;

D O I：

10.1103/PhysRevB.79.064401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study spin transport in one- and two-dimensional Heisenberg antiferromagnets. In one dimension we take spin S=1. The longitudinal spin conductivity is calculated using the Kubo formula. The magnetic properties of low-dimensional systems are significantly modified by strong correlations effects. The models studied here show unconventional transport behavior: the computed spin conductivity exhibits a nonzero Drude weight at finite temperatures and thus a ballistic character. We present results for the regular part of the conductivity as a function of the frequency.

引用

页数：5

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