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Many conductors, including recently studied Dirac materials, show saturationof coherence length on decreasing temperature. This surprising phenomenon isassigned to external noise, residual magnetic impurities or two-level systemsspecific to non-crystalline solids. Here, by considering the SnTe-class ofcompounds as an example, we show theoretically that breaking of mirror symmetrydeteriorates Berry's phase quantization, leading to additional dephasing inweak-antilocalization magnetoresistance (WAL-MR). Our experimental studies ofWAL-MR corroborate these theoretical expectations in (111) Pb$_{1-x}$Sn$_x$Sethin film with Sn contents $x$ corresponding to both topological crystallineinsulator and topologically trivial phases. In particular, we find theshortening of the phase coherence length in samples with intentionally brokenmirror symmetry. Our results indicate that the classification of quantumtransport phenomena into universality classes should encompass, in addition totime-reversal and spin-rotation invariances, spatial symmetries in specificsystems.

physical review. b./physical review. b

Signatures of dephasing by mirror-symmetry breaking in  weak-antilocalization magnetoresistance across the topological transition in  Pb$_{1-x}$Sn$_{x}$Se