National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
Laboratory of Quantum Engineering and Quantum Materials, ICMP and SPTE, South China Normal University, Guangzhou 510006, China.
Phys Rev Lett. 2019 Jan 25;122(3):036601. doi: 10.1103/PhysRevLett.122.036601.
Weyl semimetals (WSMs) host charged Weyl fermions as emergent quasiparticles. We develop a unified analytical theory for the anomalous positive longitudinal magnetoconductivity (LMC) in a WSM, which bridges the gap between the classical and ultraquantum approaches. More interestingly, the LMC is found to exhibit periodic-in-1/B quantum oscillations, originating from the oscillations of the nonequilibrium chiral chemical potential. The quantum oscillations, superposed on the positive LMC, are a remarkable fingerprint of a WSM phase with a chiral anomaly, whose observation is a valid criteria for identifying a WSM material. In fact, such quantum oscillations were already observed by several experiments.
外尔半金属（WSM）中存在作为准粒子出现的带电外尔费米子。我们为 WSM 中的反常正纵向磁导率（LMC）发展了一个统一的分析理论，它连接了经典和超量子方法之间的差距。更有趣的是，发现 LMC 表现出周期性的 1/B 量子振荡，源自非平衡手征化学势的振荡。叠加在正 LMC 上的量子振荡是具有手征反常的 WSM 相的一个显著特征指纹，其观测是识别 WSM 材料的有效标准。事实上，已经有几个实验观察到了这种量子振荡。
