title: Reversible Fermi Level Tuning of a Sb₂Te₃ Topological Insulator by Structural Deformation.
abstract: For three-dimensional (3D) topological insulators that have a layered structure, strain was used to control critical physical properties. Here, we show that tensile strain decreases bulk carrier density while accentuating transport of topological surface state using temperature-dependent resistance and magneto-resistance measurements, terahertz-time domain spectroscopy and density functional theory calculations. The induced strain was confirmed by transmittance X-ray scattering measurements. The results show the possibility of reversible topological surface state device control using structural deformation.
authors.affiliation: †Institute of Physics and Applied Physics, Yonsei University, Seodaemun-gu, Seoul, 120-749, Republic of Korea.
authors.forename: Sang Han
authors.initials: SH
authors.lastname: Park
authors.affiliation: †Institute of Physics and Applied Physics, Yonsei University, Seodaemun-gu, Seoul, 120-749, Republic of Korea.
authors.forename: Jimin
authors.initials: J
authors.lastname: Chae
authors.affiliation: †Institute of Physics and Applied Physics, Yonsei University, Seodaemun-gu, Seoul, 120-749, Republic of Korea.
authors.forename: Kwang Sik
authors.initials: KS
authors.lastname: Jeong
authors.affiliation: †Institute of Physics and Applied Physics, Yonsei University, Seodaemun-gu, Seoul, 120-749, Republic of Korea.
authors.forename: Tae-Hyeon
authors.initials: TH
authors.lastname: Kim
authors.affiliation: †Institute of Physics and Applied Physics, Yonsei University, Seodaemun-gu, Seoul, 120-749, Republic of Korea.
authors.forename: Hyejin
authors.initials: H
authors.lastname: Choi
authors.affiliation: †Institute of Physics and Applied Physics, Yonsei University, Seodaemun-gu, Seoul, 120-749, Republic of Korea.
authors.forename: Mann-Ho
authors.initials: MH
authors.lastname: Cho
authors.affiliation: §Department of Physics, Chungnam National University, Daejeon 305-764, Republic of Korea.|‡Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea.
authors.forename: Inwoong
authors.initials: I
authors.lastname: Hwang
authors.affiliation: ∥Department of Nanoscience, University of Science and Technology, Yuseong, Daejeon 305-350, Republic of Korea.|‡Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea.
authors.forename: Myung-Ho
authors.initials: MH
authors.lastname: Bae
authors.affiliation: #Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju, 500-712, Korea.
authors.forename: Chul
authors.initials: C
authors.lastname: Kang
mesh_terms: D013691:Tellurium; D013718:Tensile Strength
chemical_list: D013691:Tellurium
keywords: DFT; PPMS; Sb2Te3; THz; Topological insulator; strain