Matus Paweł, Dantas Renato M A, Moessner Roderich, Surówka Piotr
Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany.
Würzburg-Dresden Cluster of Excellence Complexity and Topology in Quantum Matter (ct.qmat), 01187 Dresden, Germany.
Proc Natl Acad Sci U S A. 2022 Mar 22;119(12):e2200367119. doi: 10.1073/pnas.2200367119. Epub 2022 Mar 14.
SignificanceWeyl semimetals are a class of three-dimensional materials, whose low-energy excitations mimic massless fermions. In consequence they exhibit various unusual transport properties related to the presence of chiral anomalies, a subtle quantum phenomenon that denotes the breaking of the classical chiral symmetry by quantum fluctuations. In this work we present a universal description of transport in weakly disordered Weyl semimetals with several scattering mechanisms taken into account. Our work predicts the existence of a new anomaly-induced transport regime in these materials and gives a crisp experimental signature of a chiral anomaly in optical conductivity measurements. Finally, by also capturing the hydrodynamic regime of quasiparticles, our construction bridges the gap between developments in electronic fluid mechanics and three-dimensional semimetals.
重要性
外尔半金属是一类三维材料，其低能激发类似于无质量费米子。因此，它们表现出与手征反常相关的各种异常输运性质，手征反常是一种微妙的量子现象，它表示经典手征对称性被量子涨落破坏。在这项工作中，我们给出了考虑多种散射机制的弱无序外尔半金属中输运的通用描述。我们的工作预测了这些材料中一种新的反常诱导输运 regime 的存在，并在光导率测量中给出了手征反常的清晰实验特征。最后，通过捕捉准粒子的流体动力学 regime，我们的构建弥合了电子流体力学和三维半金属发展之间的差距。
