Coexistence of Diffusive and Ballistic Transport in a Simple Spin Ladder

被引：46
|
作者：
Znidaric, Marko [1 ]
机构：
[1] Univ Ljubljana, Dept Phys, Fac Math, Ljubljana 1000, Slovenia
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 07期
关键词：
DYNAMICAL SEMIGROUPS; CONSERVATION-LAWS; HUBBARD-MODEL; QUANTUM; SYSTEMS; ATOMS;
D O I：
10.1103/PhysRevLett.110.070602
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We show that in a nonintegrable spin ladder system with the XX type of coupling along the legs and the XXZ type along the rungs there are invariant subspaces that support ballistic magnetization transport. In the complementary subspace the transport is found to be diffusive. This shows that (i) quantum chaotic systems can possess ballistic subspaces, and (ii) diffusive and ballistic transport modes can coexist in a rather simple nonintegrable model. In the limit of an infinite anisotropy in rungs the system studied is equivalent to the one-dimensional Hubbard model. DOI: 10.1103/PhysRevLett.110.070602
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页数：5
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