论文标题
三维手性异常的电磁反应
Fractional Electromagnetic Response in Three-Dimensional Chiral Anomalous Semimetal
论文作者
论文摘要
三维固体中电子的磁电耦合可以通过轴支电动力学有效地描述。在这里，我们报告了三维无质量的Wilson Fermions的手性异常半学的分数磁电效应的发现，它们在能量交叉点具有线性分散体，并破坏通用力量的手性对称性。在存在电场和磁场的情况下，时间逆转和平等对称性破坏产生了四分之一量化的拓扑磁电效应，这与频带结构的绕组数字直接相关，仅是拓扑绝缘体的一半。分数电磁响应可以通过表面霍尔电导揭示，并从拓扑Kerr和Faraday旋转的测量中提取。带有应变的频带隙的过渡金属五肽\ Mathrm {Zrte_ {5}}提供了一个潜在的平台来实验测试效果。
The magnetoelectric coupling of electrons in a three-dimensional solid can be effectively described by axion electrodynamics. Here we report the discovery of the fractional magnetoelectric effect in chiral anomalous semimetals of the three-dimensional massless Wilson fermions, which have linear dispersions at the energy crossing point, and break the chiral symmetry at generic momenta. In the presence of electric and magnetic fields, the time-reversal and parity symmetry breaking give rise to the quarter-quantized topological magnetoelectric effect, which is directly related to the winding number 1/2 of the band structure, and is only one half of that for topological insulators. The fractional electromagnetic response can be revealed by the surface Hall conductance and extracted from the measurement of the topological Kerr and Faraday rotation. The transition-metal pentatelluride \mathrm{ZrTe_{5}} with a strain-tunable band gap provides a potential platform to test the effect experimentally.
