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Surface versus bulk Dirac state tuning in a three-dimensional topological Dirac semimetal

Author(s): Neupane, Madhab; Xu, Su-Yang; Alidoust, Nasser; Sankar, Raman; Belopolski, Ilya; et al

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Abstract: Recently, crystalline-symmetry-protected three-dimensional (3D) bulk Dirac semimetal phase has been experimentally identified in a stoichiometric high-mobility compound, Cd3As2. The Dirac state observed in Cd3As2 has been attributed to originate mostly from the bulk state while calculations show that the bulk and surface states overlap over the entire Dirac dispersion energy range. In this study, we unambiguously reveal doping induced evolution of the ground state of surface and bulk electron dynamics in a 3D Dirac semimetal. We develop a systematic technique to isolate the surface and bulk states in Cd3As2, by simultaneously utilizing angle-resolved photoemission spectroscopy (ARPES) and in-situ surface deposition. Our experimental results provide a method for tuning the chemical potential as well as to observe surface states degenerate with bulk states, which will be useful for future applications of 3D Dirac semimetal.
Publication Date: Jun-2015
Electronic Publication Date: 24-Jun-2015
Citation: Neupane, Madhab, Xu, Su-Yang, Alidoust, Nasser, Sankar, Raman, Belopolski, Ilya, Sanchez, Daniel S, Bian, Guang, Liu, Chang, Chang, Tay-Rong, Jeng, Horng-Tay, Wang, BaoKai, Chang, Guoqing, Lin, Hsin, Bansil, Arun, Chou, Fangcheng, Hasan, M. Zahid. (2015). Surface versus bulk Dirac state tuning in a three-dimensional topological Dirac semimetal. Physical Review B, 91 (24), 10.1103/PhysRevB.91.241114
DOI: doi:10.1103/PhysRevB.91.241114
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 1 - 5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Author's manuscript

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