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arXiv 1306.4023cond-mat.dis-nncond-mat.str-elhep-th
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无序狄拉克费米子的普适性、指数和反常相消

Universality, exponents and anomaly cancellation in disordered Dirac fermions

Vieri Mastropietro

摘要:

无序的2D手性费米子提供了包括石墨烯和拓扑绝缘体在内的几种材料的有效描述。虽然以前的分析认为,三角洲相关的障碍,没有紫外线截止,我们认为在这里的影响,短程相关的障碍和存在的动量截止,提供了一个更现实的描述凝聚态模型。我们表明,态密度是异常的临界指数函数的障碍和导电性是普遍的,只有当紫外截止被删除,作为超对称取消的异常的后果。

英文摘要:

Disordered 2D chiral fermions provide an effective description of several materials including graphene and topological insulators. While previous analysis considered delta correlated disorder and no ultraviolet cut-offs, we consider here the effect of short range correlated disorder and the presence of a momentum cut-off, providing a more realistic description of condensed matter models. We show that the density of states is anomalous with a critical exponent function of the disorder and that conductivity is universal only when the ultraviolet cut-off is removed, as consequence of the supersymmetric cancellation of the anomalies.

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。

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