Topological states with broken translational and time-reversal symmetries in a honeycomb-triangular lattice

R. Sarjonen and P. Törmä
Phys. Rev. A 91, 063605 – Published 5 June 2015

Abstract

We study fermions in a lattice, with on-site and nearest neighbor attractive interactions between two spin species. We consider two geometries: (1) both spins in a triangular lattice and (2) a mixed geometry with up spins in honeycomb and down spins in triangular lattices. We focus on the interplay between spin-population imbalance, on-site and valence bond pairing, and order parameter symmetry. The mixed geometry leads to a rich phase diagram of topologically nontrivial phases. In both geometries, we predict order parameters with simultaneous time-reversal and translational symmetry breaking.

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  • Received 23 September 2014
  • Revised 15 January 2015

DOI:https://doi.org/10.1103/PhysRevA.91.063605

©2015 American Physical Society

Authors & Affiliations

R. Sarjonen and P. Törmä*

  • COMP Centre of Excellence, Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland

  • *Corresponding author: paivi.torma@aalto.fi

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Vol. 91, Iss. 6 — June 2015

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