Low-temperature transport in Heisenberg chains.
Low-temperature transport in Heisenberg chains.
复制标题
海森堡链中的低温传输。
DOI：
10.1103/physrevlett.88.077203
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发表时间：
2001
影响因子：
8.6
通讯作者：
C. Gros
中科院分区：
文献类型：
--
作者：
Jose Alvarez;C. Gros
提出了一种通过量子蒙特卡罗精确确定有限温度下可积和不可积量子自旋链输运性质的技术。评估了可积无间隙状态下相互作用所减少的德鲁德重量。给出了具有长程相互作用的不可积系统的无间隙状态下不存在德鲁德权重的证据。我们估计了不可积性对输运性质的影响，并与最近在一维量子自旋链上的实验进行了比较。
A technique to determine accurately transport properties of integrable and nonintegrable quantum-spin chains at finite temperatures by quantum Monte Carlo is presented. The reduction of the Drude weight by interactions in the integrable gapless regime is evaluated. Evidence for the absence of Drude weight in the gapless regime of a nonintegrable system with longer-ranged interactions is presented. We estimate the effect of the nonintegrability on the transport properties and compare with recent experiments on one-dimensional quantum-spin chains.