论文标题
在Weyl半法中重新访问磁转运
Revisiting magnetotransport in Weyl semimetals
论文作者
论文摘要
最近的一系列论文声称，单独的射频散射可以导致纵向磁磁性（LMC）在Weyl Semimetals（WSMS）中的手性异常（CA）引起的正面纵向磁性（LMC）。我们重新审视了WSM中CA诱导的LMC的问题，并表明内部模子散射本身不会导致LMC的增强。在零节间散射的极限中，手动电荷必须保持保守，这实际上可以减少LMC。仅在非零间散射（但是较弱）的情况下，由于手性电荷的不保守，才能获得正LMC。即使是弱节间散射在产生阳性LMC的情况下也足够，因为它在两个节点上都重新分布了电荷，尽管在时间尺度上，它比内模散射的时间尺度大。此外，我们的计算表明，与最近的作品相比，在不均匀的WSMS菌株中，轴向磁场$ B_5 $本身会导致负纵向磁电导和负平面霍尔电导。
A series of recent papers have claimed that intranode scattering, alone, can contribute to positive longitudinal magnetoconductance (LMC) due to chiral anomaly (CA) in Weyl semimetals (WSMs). We revisit the problem of CA induced LMC in WSMs, and show that intranode scattering, by itself, does not result in enhancement of LMC. In the limit of zero internode scattering, chiral charge must remain conserved, which is shown to actually decrease LMC. Only in the presence of a non-zero internode scattering (however weak), one obtains a positive LMC due to non-conservation of chiral charge. Even weak internode scattering suffices in generating positive LMC, since it redistributes charges across both the nodes, although on a time scale larger than that of the intranode scattering. Furthermore, our calculations reveal that, in contrast to recent works, in inhomogeneous WSMs strain induced axial magnetic field $B_5$, by itself, leads to negative longitudinal magnetoconductance and a negative planar Hall conductance.
