Correlation between changeover from weak antilocalization (WAL) to weak localization (WL) and positive to negative magnetoresistance in S-doped Bi1.5Sb0.5Te1.3Se1.7

The magneto-transport and angle-resolved photoelectron spectroscopy (ARPES) of the S-doped Bi1.5Sb0.5Te1.3Se1.7 system have been investigated. Both the positive magnetoresistance (pMR) and negative magnetoresistance (nMR) under a perpendicular magnetic field as well as a changeover from weak antilocalization (WAL) to weak localization (WL) are observed. The interplay between pMR and nMR is elucidated in terms of the dephasing and spin-orbit scattering time scales. The topological surface state bands have been explored using ARPES.

Automated summary

The magneto-transport and ARPES of the S-doped Bi1.5Sb0.5Te1.3Se1.7 system were investigated, and both pMR and nMR, as well as a transition from WAL to WL, were observed. The interplay between pMR and nMR was elucidated, and the topological surface state bands were explored using ARPES.