arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1206.4372cond-mat.str-elcond-mat.supr-con
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相互作用动态无序模型中的热化击穿和电导率改善

Thermalization Breakdown and Conductivity Improvement within the Interacting Dynamic Disorder Model

Yao Yao, Yiqiang Zhan, Xiaoyuan Hou, Chang-Qin Wu

摘要:

基于Kubo公式框架,发展了最小纠缠典型热态算法,研究了一维无自旋费米子模型中电流-电流关联函数的温度和时间依赖性,同时考虑了电子-电子(e-e)格点间相互作用和经典声子引起的动力学无序.在没有e-e相互作用的情况下,数值结果表明,随时间变化的相关性呈指数衰减,可以与解析推导的结果,即广义Langevin方程的结果进行精确的比较。更重要的是,当存在足够强的电子-电子相互作用时,我们发现在小的动力学无序区存在长时间的关联,这表明热弛豫的破坏,这是一个典型的多体效应。在此基础上,我们表明,这可能是适用于理解的金属类电荷传输和电导率的异常改善相对于在K $_3$ C $_{60}$,有机超导材料的再掺杂实验。

英文摘要:

Based on the framework of Kubo formulism, we develop the minimally entangled typical thermal state algorithm to study the temperature and time dependence of current-current correlation function in one-dimensional spinless fermion model, taking into account both the electron-electron (e-e) intersite interaction and the dynamic disorder induced by classical phonons. Without e-e interaction, the numerical results, showing an exponential decay of the time dependent correlation, could be precisely compared with that from the analytical derivation, namely, from the generalized Langevin equation. More importantly, when a strong enough e-e interaction is presence, we find a long-time correlation in the regime of small dynamic disorder, indicating the breakdown of thermal relaxation, which is a typical many-body effect. On the basis of this finding, we show that it might be applied to understand the metalliclike charge transport and the abnormal improvement of the conductivity with respect to the redoping experiment in K$_3$C$_{60}$, an organic superconducting material.

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