Terahertz conductivity of topological surface states in Bi1.5Sb0.5Te1.8Se1.2

Tang, Chi Sin; Xia, Bin; Zou, Xingquan; Chen, Shi; Ou, Hong-Wei; Wang, Lan; Rusydi, A.; Zhu, Jian-Xin; Chia, Elbert E.  M.

doi:10.1038/srep03513

Title: Terahertz conductivity of topological surface states in Bi_1.5Sb_0.5Te_1.8Se_1.2

Journal Article · Tue Dec 17 00:00:00 EST 2013 · Scientific Reports

DOI:https://doi.org/10.1038/srep03513· OSTI ID:1624675

Tang, Chi Sin ^[1]; Xia, Bin ^[1]; Zou, Xingquan ^[1]; Chen, Shi ^[1]; Ou, Hong-Wei ^[2]; Wang, Lan ^[1]; Rusydi, A. ^[2]; Zhu, Jian-Xin ^[3]; Chia, Elbert E. M. ^[1]

Nanyang Technological Univ. (Singapore). Division of Physics and Applied Physics, School of Physical and Mathematical Sciences
Nanyang Technological Univ. (Singapore). Dept. of Physics, NUSNNI-NanoCore
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Topological insulators are electronic materials with an insulating bulk and conducting surface. However, due to free carriers in the bulk, the properties of the metallic surface are difficult to detect and characterize in most topological insulator materials. Recently, a new topological insulator Bi_1.5Sb_0.5Te_1.7Se_1.3 (BSTS) was found, showing high bulk resistivities of 1–10 Ω.cm and greater contrast between the bulk and surface resistivities compared to other Bi-based topological insulators. Using Terahertz Time-Domain Spectroscopy (THz-TDS), we present complex conductivity of BSTS single crystals, disentangling the surface and bulk contributions. We find that the Drude spectral weight is 1–2 orders of magnitude smaller than in other Bi-based topological insulators and similar to that of Bi₂Se₃ thin films, suggesting a significant contribution of the topological surface states to the conductivity of the BSTS sample. Moreover, an impurity band is present about 30 meV below the Fermi level and the surface and bulk carrier densities agree with those obtained from transport data. Furthermore, from the surface Drude contribution, we obtain a ~98% transmission through one surface layer — this is consistent with the transmission through single-layer or bilayer graphene, which shares a common Dirac-cone feature in the band structure.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation Singapore (NRF); Ministry of Education (MoE); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1624675

Journal Information:: Scientific Reports, Vol. 3, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Terahertz conductivity of topological surface states in Bi_1.5Sb_0.5Te_1.8Se_1.2