Helically spin-polarized Dirac fermions (HSDF) in protected topological surface states (TSS) are of high interest as a new state of quantum matter. In three-dimensional (3D) materials with TSS, electronic bulk states often mask the transport properties of HSDF. Recently, the high-field Hall resistance and low-field magnetoresistance indicate that the TSS may coexist with a layered two-dimensional electronic system (2DES). Here, we demonstrate quantum oscillations of the Hall resistance at temperatures up to 50 K in bulk Bi2Se3 with a high electron density n of about 2⋅1019 cm−3. From the angular and temperature dependence of the Hall resistance and the Shubnikov-de Haas oscillations we identify 3D and 2D contributions to transport. Angular resolved photoemission spectroscopy proves the existence of TSS. We present a model for Bi2Se3 and suggest that the coexistence of TSS and 2D layered transport stabilizes the quantum oscillations of the Hall resistance.
@article{arxiv.1707.09181,
title = {High-temperature quantum oscillations of the Hall resistance in bulk Bi$_2$Se$_3$},
author = {Marco Busch and Olivio Chiatti and Sergio Pezzini and Steffen Wiedmann and Jaime Sánchez-Barriga and Oliver Rader and Lada V. Yashina and Saskia F. Fischer},
journal= {arXiv preprint arXiv:1707.09181},
year = {2017}
}