Time reversal symmetry broken fractional topological phases at zero magnetic field

Tobias Meng, Eran Sela

Research output: Contribution to journalArticlepeer-review

Abstract

We extend the coupled-wire construction of quantum Hall phases, and search for fractional topological insulating states in models of weakly coupled wires at zero external magnetic field. Focusing on systems beyond double copies of fractional quantum Hall states at opposite fields, we find that spin-spin interactions can stabilize a large family of fractional topological phases with broken time reversal invariance. The latter is manifested by spontaneous spin polarization, by a finite Hall conductivity, or by both. This suggests the possibility that fractional topological insulators may be unstable to spontaneous symmetry breaking.

Original languageEnglish
Article number235425
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number23
DOIs
StatePublished - 15 Dec 2014

Funding

FundersFunder number
Israel Science Foundation
Swiss National Science Foundation

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