论文标题
pb $ _ {1-x} $ _ {1-x} $ sn $ _ {x} $ se中的弱抗元素磁路线的镜像对称性损坏的签名
Signatures of dephasing by mirror-symmetry breaking in weak-antilocalization magnetoresistance across the topological transition in Pb$_{1-x}$Sn$_{x}$Se
论文作者
论文摘要
许多导体，包括最近研究的狄拉克材料，都表明在降低温度下相干长度的饱和度。这种令人惊讶的现象被分配给外部噪声，残留的磁性杂质或针对非晶体固体的两级系统。在这里，通过将SNTE级化合物为例，我们从理论上说明破坏镜像对称性的相位量化，导致弱抗静脉化磁静脉内（WAL-MR）的额外脱位。我们对WAL-MR的实验研究证实了（111）pb $ _ {1-x} $ sn $ _x $ se薄膜的这些理论期望，带有SN内容$ x $，对应于拓扑结晶绝缘子和拓扑琐碎的阶段。特别是，我们发现具有故意破坏镜子对称性的样品中相干长度的缩短。我们的结果表明，除了时间交流和自旋旋转不变，在特定系统中的空间对称性外，将量子传输现象分为普遍性类别还应包括在内。
Many conductors, including recently studied Dirac materials, show saturation of coherence length on decreasing temperature. This surprising phenomenon is assigned to external noise, residual magnetic impurities or two-level systems specific to non-crystalline solids. Here, by considering the SnTe-class of compounds as an example, we show theoretically that breaking of mirror symmetry deteriorates Berry's phase quantization, leading to additional dephasing in weak-antilocalization magnetoresistance (WAL-MR). Our experimental studies of WAL-MR corroborate these theoretical expectations in (111) Pb$_{1-x}$Sn$_x$Se thin film with Sn contents $x$ corresponding to both topological crystalline insulator and topologically trivial phases. In particular, we find the shortening of the phase coherence length in samples with intentionally broken mirror symmetry. Our results indicate that the classification of quantum transport phenomena into universality classes should encompass, in addition to time-reversal and spin-rotation invariances, spatial symmetries in specific systems.
