Interaction-Driven Surface Chern Insulator in Nodal Line Semimetals

Research output: Contribution to journalArticle

Researchers

Research units

  • Swiss Federal Institute of Technology Zurich
  • College of Science
  • Nanjing University of Aeronautics and Astronautics

Abstract

Nodal line semimetals are characterized by nontrivial bulk-band crossings, giving rise to almost flat drumheadlike surface states (DSS), which provide an attractive playground where interaction can induce symmetry-broken states and potential emergent phases. Here, we show that electronic interaction drives a Stoner ferromagnetic instability in the DSS while the bulk remains nonmagnetic, which together with spin-orbit coupling drive the surface states into a 2D Chern insulator. We show that each piece of DSS carries a half-integer topological charge, which for systems containing two pieces of DSS yield a net Chern number C=-1. We show that this phenomenology is robust against chiral-symmetry breaking, which gives a finite dispersion to the DSS. Our results show that nodal line semimetals are a promising platform to implement surface Chern insulators and dissipationless electron transport by exploiting enhanced interaction effects of the DSS.

Details

Original languageEnglish
Article number016803
JournalPhysical Review Letters
Volume122
Issue number1
Publication statusPublished - 9 Jan 2019
MoE publication typeA1 Journal article-refereed

ID: 36717717