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Symmetry demanded topological nodal-line materials

Authors :
Shuo-Ying Yang
Hao Yang
Elena Derunova
Stuart S. P. Parkin
Binghai Yan
Mazhar N. Ali
Source :
Advances in Physics: X, Vol 3, Iss 1 (2018)
Publication Year :
2018
Publisher :
Taylor & Francis Group, 2018.

Abstract

The realization of Dirac and Weyl physics in solids has made topological materials one of the main focuses of condensed matter physics. Recently, the topic of topological nodal line semimetals, materials in which Dirac or Weyl-like crossings along special lines in momentum space create either a closed ring or line of degeneracies, rather than discrete points, has become a hot topic in topological quantum matter. Here, we review the experimentally confirmed and theoretically predicted topological nodal line semimetals, focusing in particular on the symmetry protection mechanisms of the nodal lines in various materials. Three different mechanisms: a combination of inversion and time-reversal symmetry, mirror reflection symmetry, and non-symmorphic symmetry and their robustness under the effect of spin orbit coupling are discussed. We also present a new Weyl nodal line material, the Te-square net compound KCu $ _2 $ EuTe $ _4 $ , which has several Weyl nodal lines including one extremely close to the Fermi level ( $ < $ 30 meV below E $ _F $ ). Finally, we discuss potential experimental signatures for observing exotic properties of nodal line physics.

Details

Language :
English
ISSN :
23746149
Volume :
3
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Advances in Physics: X
Publication Type :
Academic Journal
Accession number :
edsdoj.15efe6f260ac47968646ab92c568f416
Document Type :
article
Full Text :
https://doi.org/10.1080/23746149.2017.1414631