Record Details

Title:
Excitonic Instability and Pseudogap Formation in Nodal Line Semimetal ZrSiS
Affiliation(s):
EuXFEL staff, Other
Author group:
Theory
Keyword(s):
Topic:
Scientific area:
Abstract:
Electron correlation effects are studied in ZrSiS using a combination of first-principles and model approaches. We show that basic electronic properties of ZrSiS can be described within a two-dimensional lattice model of two nested square lattices. A high degree of electron-hole symmetry characteristic for ZrSiS is one of the key features of this model. Having determined model parameters from first-principles calculations, we then explicitly take electron-electron interactions into account and show that, at moderately low temperatures, ZrSiS exhibits excitonic instability, leading to the formation of a pseudogap in the electronic spectrum. The results can be understood in terms of Coulomb-interaction-assisted pairing of electrons and holes reminiscent of that of an excitonic insulator. Our finding allows us to provide a physical interpretation of the unusual mass enhancement of charge carriers in ZrSiS recently observed experimentally.
Imprint:
American Physical Society, 2018
Journal Information:
Physical Review Letters, 120 (21), 216401 (2018)
Related external records:
Language(s):
English


Export


 Record created 2018-11-27, last modified 2018-12-19

Fulltext:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)