Work

Topological Insulators and Nematic Phases from Spontaneous Symmetry Breaking in

Year: 2010

Type: article

Abstract: We investigate the stability of a quadratic band-crossing point (QBCP) in 2D fermionic systems. At the non-interacting level, we show that a QBCP exists and is topologically stable for a Berry flux {-+}2{pi}, if the point symmetry group has either fourfold or sixfold rotational symmetries. This putative topologically stable free-fermion QBCP is marginally unstable to arbitrarily weak shortrange repulsive interactions. We consider both spinless and spin-1/2 fermions. Four possible ordered states result: a quantum anomalous Hall phase, a quantum spin Hall phase, a nematic phase, and a nematic-spin-nematic phase.

Source: University of North Texas Digital Library (University of North Texas)

Author: Kuei Sun

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, U.S. Department of Energy, University of Illinois at Urbana-Champaign, Office of Science, Division of Materials Research

Awards: G1229526393, G222768804, G2371548206, G303061748, G495301720, G498139845, G5570207115, MATERIALS SCIENCE RESEARCH, Applications of Field Theory to Condensed Matter Physics, PROPERTIES OF LOCALLY CHARGE ORDERED CONDUCTORS, G8382000481, G969889393

OpenAlex ID: W2269110752

FWCI:

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