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

Madhab Neupane, Su Yang Xu, Nasser Alidoust, Raman Sankar, Ilya Belopolski, Daniel S. Sanchez, Guang Bian, Chang Liu, Tay Rong Chang, Horng Tay Jeng, Baokai Wang, Guoqing Chang, Hsin Lin, Arun Bansil, Fangcheng Chou, M. Zahid Hasan

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Abstract

Recently, a 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. The technique demonstrated in this study by simultaneously using angle-resolved photoemission spectroscopy (ARPES) and in situ surface deposition isolates the surface and bulk states in Cd3As2. 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 a 3D Dirac semimetal.

Original languageEnglish (US)
Article number241114
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number24
DOIs
StatePublished - Jun 24 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Neupane, M., Xu, S. Y., Alidoust, N., Sankar, R., Belopolski, I., Sanchez, D. S., Bian, G., Liu, C., Chang, T. R., Jeng, H. T., Wang, B., Chang, G., Lin, H., Bansil, A., Chou, F., & Hasan, M. Z. (2015). Surface versus bulk Dirac state tuning in a three-dimensional topological Dirac semimetal. Physical Review B - Condensed Matter and Materials Physics, 91(24), [241114]. https://doi.org/10.1103/PhysRevB.91.241114