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Cd<sub>3</sub>As<sub>2</sub>: Dirac semimetal to Weyl semimetal

ORAL

Abstract

Dirac and Weyl semimetals have attracted much attention in the past few years. The Dirac compound Cd3As2 has seen renewed interest due to reports of proximity-induced surface superconductivity [1] and quantum Hall effect in thin films [2]. Using first-principles based theoretical methods, we show that by breaking time-reversal symmetry upon the application of an external Zeeman magnetic field, the four-fold degenerate Dirac node in Cd3As2 splits into four non-degenerate Weyl nodes, of which two are simple Weyl nodes of chirality ±1 and other have chiral charges of ±2. We calculate the evolution of the Fermi surfaces and their contributions to the anomalous Hall conductivity as a function of magnetic field and Fermi level position. Our work forms a basis for understanding how the resulting hole and electron pockets may play a role in generating complex states such as unconventional forms of superconductivity.
References:
1. Ce Huang et al, Nature Communications 10, 2217 (2019)
2. Shinichi Nishihaya et al, Nature Communications 10, 2564 (2019)

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Presenters

  • Santu Baidya

    Department of Physics and Astronomy, Piscataway, NJ 08854, Rutgers University, Department of Physics and Astronomy, Rutgers University

Authors

  • Santu Baidya

    Department of Physics and Astronomy, Piscataway, NJ 08854, Rutgers University, Department of Physics and Astronomy, Rutgers University

  • David Vanderbilt

    Department of Physics and Astronomy, Piscataway, NJ 08854, Rutgers University, Department of Physics and Astronomy, Rutgers University, New Brunswick, NJ, USA, Department of Physics & Astronomy, Rutgers University, Physics and Astronomy, Rutgers University, Department of Physics and Astronomy, Rutgers University, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, United States, Rutgers University, Physics, Rutgers University, Department of Physics and Astronomy, Rutgers University, New Brunswick, Rutgers University, New Brunswick