Seminarium Fizyki Ciała Stałego

Weak localization (WL) and weak antilocalization (WAL) belong to the family of one-electron interference phenomena. Since their theoretical prediction in 1980 and experimental detection in disordered metals and semiconductors, these effects have become a powerful tool to study phase-coherent transport and spin-orbit interaction. Time- or spin-invariance breaking already was shown to convert WAL to WL, though the influence of spatial symmetries on these effects remained unexplored. In this talk, I will discuss our recent results [1], which illustrate the influence of spatial symmetries on WAL magnetoresistance. Within this work, we had shown both theoretically and experimentally for the SnTe-class of topological crystalline insulators that symmetries of the system rather than topological order are responsible for the quantization of the Berry phase, and that mirror-symmetry breaking can lead to dephasing and, hence, to apparent saturation of the phase coherence length at low temperatures.[1] A. Kazakov et al. arXiv:2002.07622 (2020)UwagaSeminarium w trybie zdalnympatrz instrukcja :instrukcja: (pdf file)AttentionThe seminar in the remote modesee instruction :instruction: (pdf file)