Surface Versus Bulk Dirac States Tuning in a Three-Dimensional Topological Dirac Semimetal

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.

5 pages, 4 figures

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• Topological superconductivity in Dirac semimetals
• Superconductivity in doped Dirac semimetals
• Nernst effect in Dirac and inversion-asymmetric Weyl semimetals
• Emergent Weyl nodes and Fermi arcs in a Floquet Weyl semimetal
• Emergent vortex Majorana zero mode in iron-based superconductors
• Large optical conductivity of Dirac semimetal Fermi arc surfaces states
• Quantum Hall effect induced by chiral Landau levels in topological semimetal films
• Discovery of magnetic topological crystals