物理
Weyl半金属
光子
手征异常
半金属
霍尔效应
费米子
凝聚态物理
手性(物理)
泡利矩阵
量子力学
磁场
带隙
Nambu–Jona Lasinio模型
作者
Ching-Kit Chan,Patrick A. Lee,Kenneth S. Burch,Jung Hoon Han,Ying Ran
标识
DOI:10.1103/physrevlett.116.026805
摘要
The Weyl semimetal is characterized by three-dimensional linear band touching points called Weyl nodes. These nodes come in pairs with opposite chiralities. We show that the coupling of circularly polarized photons with these chiral electrons generates a Hall conductivity without any applied magnetic field in the plane orthogonal to the light propagation. This phenomenon comes about because with all three Pauli matrices exhausted to form the three-dimensional linear dispersion, the Weyl nodes cannot be gapped. Rather, the net influence of chiral photons is to shift the positions of the Weyl nodes. Interestingly, the momentum shift is tightly correlated with the chirality of the node to produce a net anomalous Hall signal. Application of our proposal to the recently discovered TaAs family of Weyl semimetals leads to an order-of-magnitude estimate of the photoinduced Hall conductivity which is within the experimentally accessible range.
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