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arXiv 1506.05136cond-mat.mes-hallhep-th
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Dirac晶体中弹性规范场的Hall粘滞

Hall viscosity from elastic gauge fields in Dirac crystals

Alberto Cortijo, Yago Ferreirós, Karl Landsteiner, María A. H. Vozmediano

摘要:

狄拉克物理和弹性的结合已经在石墨烯中进行了详细的探索,所谓的“弹性规范场“已经产生了一个全新的研究和应用领域:应变电子学。这些弹性场耦合到费米子作为电磁场的事实意味着许多电磁响应将具有以前未探索的弹性对应物。在这项工作中,我们将首先表明,弹性规范场的存在将是规则,而不是在大多数的拓扑非平凡的材料在二维和三维的例外。特别是,我们将提取的弹性规范场与最近观察到的外尔半金属,“三维石墨烯”。众所周知,量子电动力学受到手征反常的影响,其后果最近在物质系统中得到了探索。我们将表明,与异常的物理学,并作为霍尔电导率的对应物,弹性材料将有一个霍尔粘度在二维和三维的系数数量级大于先前研究的响应。新效应的幅度和普遍性将大大提高这种拓扑非耗散响应的实验观察机会。

英文摘要:

The combination of Dirac physics and elasticity has been explored at length in graphene where the so--called "elastic gauge fields" have given rise to an entire new field of research and applications: Straintronics. The fact that these elastic fields couple to fermions as the electromagnetic field, implies that many electromagnetic responses will have elastic counterparts not explored before. In this work we will first show that the presence of elastic gauge fields will be the rule rather than the exception in most of the topologically non--trivial materials in two and three dimensions. In particular we will extract the elastic gauge fields associated to the recently observed Weyl semimetals, the "three dimensional graphene". As it is known, quantum electrodynamics suffers from the chiral anomaly whose consequences have been recently explored in matter systems. We will show that, associated to the physics of the anomalies, and as a counterpart of the Hall conductivity, elastic materials will have a Hall viscosity in two and three dimensions with a coefficient orders of magnitude bigger than the previously studied response. The magnitude and generality of the new effect will greatly improve the chances for the experimental observation of this topological, non dissipative response.

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