2017/07/28 by M. Busch, Olivio Chiatti, Busch, Marco +13 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.1707.09181
openalex publication_date 2017/07/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Helically spin-polarized Dirac fermions (HSDF) in protected topological\nsurface states (TSS) are of high interest as a new state of quantum matter. In\nthree-dimensional (3D) materials with TSS, electronic bulk states often mask\nthe transport properties of HSDF. Recently, the high-field Hall resistance and\nlow-field magnetoresistance indicate that the TSS may coexist with a layered\ntwo-dimensional electronic system (2DES). Here, we demonstrate quantum\noscillations of the Hall resistance at temperatures up to 50 K in bulk\nBi2Se3 with a high electron density n of about 2 !\⋅ !1019\ncm-3. From the angular and temperature dependence of the Hall resistance\nand the Shubnikov-de Haas oscillations we identify 3D and 2D contributions to\ntransport. Angular resolved photoemission spectroscopy proves the existence of\nTSS. We present a model for Bi2Se3 and suggest that the coexistence of\nTSS and 2D layered transport stabilizes the quantum oscillations of the Hall\nresistance.\n