Drude weight at finite temperatures for some nonintegrable quantum systems in one dimension.
Drude weight at finite temperatures for some nonintegrable quantum systems in one dimension.
复制标题
对于一些一维不可积量子系统，有限温度下的德鲁德重量。
DOI：
10.1103/physrevlett.90.197202
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发表时间：
2003
影响因子：
8.6
通讯作者：
N. Kawakami
中科院分区：
文献类型：
--
作者：
S. Fujimoto;N. Kawakami
利用共形微扰理论，我们证明了，对于某些在低能极限下具有Luttinger液体不动点的一维量子液体，即使系统不可积并且总的情况下，有限温度下的Drude重量也不为零。电流不守恒。我们还得到了Heisenberg XXZ自旋链的Drude重量的渐近精确的低温公式，它与最近的数值结果吻合得很好。
Using conformal perturbation theory, we show that, for some classes of the one-dimensional quantum liquids that possess the Luttinger liquid fixed point in the low-energy limit, the Drude weight at finite temperatures is nonvanishing, even when the system is nonintegrable and the total current is not conserved. We also obtain the asymptotically exact low-temperature formula of the Drude weight for Heisenberg XXZ spin chains, which agrees quite well with recent numerical data.