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Finite-temperature Drude weight within the anisotropic Heisenberg chain

机译:各向异性海森堡链中的有限温度德鲁伊权重

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摘要

Finite-temperature Drude weight (spin stiffness) D(T) is evaluated within the anisotropic spin-1/2 Heisenberg model on a chain using the exact diagonalization for small systems. It is shown that odd-side chains allow for more reliable scaling and results, in particular, if one takes into account corrections due to low-frequency finite-size anomalies. At high T and zero magnetization D is shown to scale to zero approaching the isotropic point △ = 1. On the other hand, for A > 2 at all magnetizations D is nearly exhausted with the overlap with the conserved energy current. Results for the T variation D(T) are also presented.
机译:在小型系统上,使用精确的对角线化在链上的各向异性spin-1 / 2 Heisenberg模型中评估有限温度Drude重量(旋转刚度)D(T)。结果表明,奇数侧链允许更可靠的缩放和结果,特别是如果考虑到由于低频有限尺寸异常而进行的校正的话。在高T和零磁化强度D下,趋近于各向同性点△= 1,磁化强度D变为零。另一方面,对于A> 2,在所有磁化强度下D几乎耗尽,并且与守恒的能量电流重叠。还给出了T变化D(T)的结果。

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  • 来源
    《Physical review》 |2011年第15期|p.155125.1-155125.5|共5页
  • 作者单位

    Institute, SI-1000 Ljubljana, Slovenia;

    rnInstitute, SI-1000 Ljubljana, Slovenia Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana, Slovenia;

    rnDepartment of Physics, University of Crete and Foundation for Research and Technology-Hellas, 71003 Heraklion, Greece;

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  • 正文语种 eng
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  • 关键词

    strongly correlated electron systems; heavy fermions; spin chain models;

    机译:强相关电子系统;重费米子自旋链模型;

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