Topological Insulators and Nematic Phases from Spontaneous Symmetry Breaking in
Journal Article
·
· Submitted to Physical Review Letters
OSTI ID:981390
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 981390
- Report Number(s):
- SLAC-PUB-14078; TRN: US1003922
- Journal Information:
- Submitted to Physical Review Letters, Journal Name: Submitted to Physical Review Letters
- Country of Publication:
- United States
- Language:
- English
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