arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1406.6486cond-mat.str-el
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Holstein极化子的迁移率:一种无偏的方法

Mobility of Holstein polaron: an unbiased approach

A. S. Mishchenko, N. Nagaosa, G. De Filippis, A. de Candia, V. Cataudella

摘要:

在热力学极限下,用数值解析延拓结合图解法和世界线蒙特卡罗方法,给出了一维Holstein极化子迁移率$μ$的第一无偏结果.我们首次通过$ω$和$T$在宽参数范围内的特性依赖性,确定了$λ-T$平面上的几个不同区域,包括带导区、非相干金属区、激活跳跃区和高温饱和区。我们观察到的第一次,虽然在不同的$λ$值的迁移率和平均自由程不同的许多数量级在小的温度下,它们的值在$T$大于带宽变得非常接近彼此。

英文摘要:

We present the first unbiased results for the mobility $μ$ of one-dimensional Holstein polaron obtained by numerical analytic continuation combined with diagrammatic and world-line Monte Carlo methods in the thermodynamic limit. We have identified for the first time, by the characteristic $ω$ and $T$ dependence in the wide region of parameters, several distinct regimes in the $λ-T$ plane including band conduction region, incoherent metallic region, activated hopping region, and high temperature saturation region. We observe for the first time that although mobilities and mean free paths at different values of $λ$ differ by many orders of magnitude at small temperatures, their values at $T$ larger than the bandwidth become very close to each other.

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