Volume 133, Number 2, January 2021
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 March 2021|
Impurity effects in a two-dimensional nonsymmorphic Dirac semimetal
Department of Physics, Zhejiang Normal University - Jinhua 321004, China
Received: 11 November 2020
Accepted: 22 December 2020
We theoretically study the impurity-induced states in a two-dimensional nonsymmorphic Dirac semimetal based on the T-matrix method. For calculating the local density of states, we find that for a Dirac system with two symmetry-inequivalent Dirac points the impurity states are similar to those in an ordinary two-dimensional Dirac sysytem. Whereas for the situation of two symmetry-equivalent Dirac points, the impurity states exhibit many distinct features, which are attributed to the spin-sublattice correlation associated with nonsymmorphic symmetry. In particular, these features are robust for the presence of the chiral symmetry-breaking term. Furthermore the impurity states in a Weyl semimetal and topological insulator with nonsymmorphic symmetries are derived and discussed. Thus the impurity effects of a two-dimensional nonsymmorphic Dirac semimetal can be used to probe the various topological nontrivial phases.
PACS: 72.10.Fk – Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect) / 73.20.At – Surface states, band structure, electron density of states / 74.55.+v – Tunneling phenomena: single particle tunneling and STM
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