Topological features of quantum magnetotransport in Bi1-xSbx (0 ≤ x ≤ 0.2) bicrystals

Abstract

Unusual topological features related to the interface Dirac electrons have been revealed: the longitudinal Hall quasi-plateaus, along with minima in magnetoresistance; the manifestation of Umkehr effect, non- allowed by the crystal symmetry; two new harmonics of quantum transport from interface layers, which characterizes larger than cross-sectional areas of the FS of crystallites; the magnetoresistance peculiarities, indicating both the occurrence of a small group of the infinitely moving electrons and the electronic phase transitions of the semiconductor–semimetal type in magnetic field.