Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101978
Title: Excitonic Instability and Pseudogap Formation in Nodal Line Semimetal ZrSiS
Authors: Rudenko, A. N.
Stepanov, E. A.
Lichtenstein, A. I.
Katsnelson, M. I.
Issue Date: 2018
Publisher: American Physical Society
Citation: Excitonic Instability and Pseudogap Formation in Nodal Line Semimetal ZrSiS / A. N. Rudenko, E. A. Stepanov, A. I. Lichtenstein, et al. — DOI 10.1103/PhysRevLett.120.216401 // Physical Review Letters. — 2018. — Vol. 120. — Iss. 21. — 216401.
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. © 2018 American Physical Society.
Keywords: CALCULATIONS
CRYSTAL LATTICES
ELECTRON-ELECTRON INTERACTIONS
ELECTRONIC PROPERTIES
ELECTRONS
SILICON COMPOUNDS
ZIRCONIUM COMPOUNDS
ELECTRON CORRELATION EFFECT
ELECTRON HOLE SYMMETRY
ELECTRONIC SPECTRUM
ELECTRONS AND HOLES
EXCITONIC INSULATOR
FIRST-PRINCIPLES CALCULATION
PHYSICAL INTERPRETATION
TWO-DIMENSIONAL LATTICE MODEL
SULFUR COMPOUNDS
URI: http://hdl.handle.net/10995/101978
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85047732615
PURE ID: 7277191
0a9416cb-5328-4880-b407-ad43acb24f9e
ISSN: 319007
DOI: 10.1103/PhysRevLett.120.216401
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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