arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1404.0621cond-mat.supr-concond-mat.str-el
收藏

随机局域吸引驱动的金属-超导体跃迁

Random local attraction driven metal-superconductor transitions

Naushad Ahmad Kamar, N. S. Vidhyadhiraja

摘要:

本文结合动力学平均场论、相干势近似和超导的迭代微扰理论作为杂质解,研究了无序吸引哈伯德模型。在局部吸引力$U$中引入无序。我们假设$U$按照双峰概率分布分布,其中$x$部分的位点是配对中心($U\neq0$),而$(1-x)$部分的位点是非相互作用的($U=0$)。研究发现,在临界$x=x_c$之外,一级金属-超导体相变导致在相互作用和非相互作用中诱导超导。

英文摘要:

In this paper, we investigate the disordered attractive Hubbard model by combining dynamical mean field theory, coherent potential approximation and iterated perturbation theory for superconductivity as an impurity solver. Disorder is introduced in the local attraction $U$. We assume that $U$ is distributed according to a bimodal probability distribution, wherein an $x$ fraction of sites are pairing centers ($U\neq0$) and $(1-x)$ fraction of sites are non-interacting ($U=0$). It is found that beyond a critical $x=x_c$, a first order metal-superconductor phase transition leads to superconductivity being induced in the interacting as well as non-interacting.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑