Signatures of dephasing by mirror-symmetry breaking in weak-antilocalization magnetoresistance across the topological transition in Pb1−xSnxSe
| Autor: | Tomasz Wojtowicz, Andrei Varykhalov, Ondřej Caha, Tomasz Wojciechowski, Tomasz Dietl, Jakub Polaczyński, Timo Hyart, Jaroslaw Z. Domagala, M. Aleszkiewicz, Wojciech Brzezicki, Valentine V. Volobuev, Alexander Kazakov, Bartłomiej Turowski, Zbigniew Adamus, Gunther Springholz |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Phase transition Magnetoresistance Dirac (video compression format) Dephasing Quantum oscillations 02 engineering and technology 021001 nanoscience & nanotechnology Topology 01 natural sciences Coherence length 0103 physical sciences 010306 general physics 0210 nano-technology Mirror symmetry Saturation (magnetic) |
| Zdroj: | Physical Review B. 103 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.103.245307 |
| Popis: | 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 noncrystalline 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) Pb1-xSnxSe 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. |
| Databáze: | OpenAIRE |
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