Negative differential conductivity in far-from-equilibrium quantum spin chains

被引：65

作者：

Benenti, Giuliano ^{[1
,2
,3
]}

Casati, Giulio ^{[1
,2
,3
,4
]}

Prosen, Tomaz ^{[5
]}

Rossini, Davide ^{[6
]}

机构：

[1] Univ Studi Insubria, CNISM, CNR, INFM, I-22100 Como, Italy

[2] Univ Studi Insubria, Ctr Nonlinear & Comples Syst, I-22100 Como, Italy

[3] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[4] Natl Univ Singapore, Ctr Quantum Technol, Singapore 117543, Singapore

[5] Univ Ljubljana, Dept Phys, Fac Math & Phys, Ljubljana 61000, Slovenia

[6] Int Sch Adv Studies SISSA, I-34014 Trieste, Italy

来源：

EPL | 2009年 / 85卷 / 03期

关键词：

SPINTRONICS; SYSTEM; MODEL;

D O I：

10.1209/0295-5075/85/37001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that, when a finite anisotropic Heisenberg spin-1/2 chain in the gapped regime is driven far from equilibrium, oppositely polarized ferromagnetic domains build up at the edges of the chain, thus suppressing quantum spin transport. As a consequence, a negative differential conductivity regime arises, where increasing the driving decreases the current. The above results are explained in terms of magnon localization and are shown to be structurally stable against breaking of integrability. Copyright (C) EPLA, 2009

引用

页数：5

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