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Movable but not removable band degeneracies in a symmorphic crystal

Journal article
Authors M. Malard
P. E. de Brito
Stellan Östlund
Henrik Johannesson
Published in Physical Review B
Volume 98
Issue 16
ISSN 2469-9950
Publication year 2018
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1103/PhysRevB.98.1651...
Keywords energy-bands, Materials Science, Physics
Subject categories Physical Sciences

Abstract

Crossings of energy bands in solids that are not pinned at symmetry points in the Brillouin zone and yet cannot be removed by perturbations are thought to be conditioned on the presence of a nonsymmorphic symmetry. In this article we show that such band crossings can actually appear also in a symmorphic crystal. A study of a class of tight-binding multiband one-dimensional lattice models of spinful electrons reveals that chiral, time-reversal, and site-mirror symmetries are sufficient to produce such movable but not removable band degeneracies.

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