Nodal lines and boundary modes in topological dirac semimetals with magnetism

Yasufumi Araki, Jin Watanabe, Kentaro Nomura

Research output: Contribution to journalArticlepeer-review

Abstract

While nodal-line semimetals with magnetism have been theoretically predicted and experimentally observed in a few compounds, idea on the relation between the magnetic order and the electronic structure is still limited. We theoretically explore the electronic structure in bulk and boundary of such a magnetic nodal-line state by introducing magnetism in topological Dirac semimetal (TDSM). TDSMs, such as Cd3As2 and Na3Bi, are characterized by a pair of spin-degenerate Dirac points protected by rotational symmetries of crystals. By introducing local magnetic moments coupled to the electron spins in the lattice model of TDSM, we show that the TDSM can turn into either a Weyl semimetal or a nodal-line semimetal, which is determined by the orbital dependence in the exchange coupling and the direction of magnetization formed by the magnetic moments. In this magnetic nodal-line semimetal state, we find zero modes with drumhead-like band structure at the boundary that are characterized by the topological number of Z. Those zero modes are numerically demonstrated by introducing magnetic domain walls in the lattice model.

Original languageEnglish
Article number094702
Journaljournal of the physical society of japan
Volume90
Issue number9
DOIs
Publication statusPublished - 2021 Sep 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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