Informace o publikaci

Signatures of dephasing by mirror-symmetry breaking in weak-antilocalization magnetoresistance across the topological transition in Pb1-xSnxSe

Autoři	KAZAKOV Alexander BRZEZICKI Wojciech HYART Timo TUROWSKI Bartlomiej POLACZYNSKI Jakub ADAMUS Zbigniew ALESZKIEWICZ Marta WOJCIECHOWSKI Tomasz DOMAGALA Jaroslaw Z CAHA Ondřej VARYKHALOV Andrei SPRINGHOLZ Gunther WOJTOWICZ Tomasz VOLOBUEV Valentine V DIETL Tomasz
Rok publikování	2021
Druh	Článek v odborném periodiku
Časopis / Zdroj	Physical Review B
Fakulta / Pracoviště MU	Přírodovědecká fakulta
Citace
www	https://doi.org/10.1103/PhysRevB.103.245307
Doi	http://dx.doi.org/10.1103/PhysRevB.103.245307
Klíčová slova	BI2SE3 THIN-FILMS; CRYSTALLINE INSULATOR; QUANTUM OSCILLATIONS; PHASE-TRANSITION; TRANSPORT; LOCALIZATION; STATES; METAL
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.