Topological quantum phase transitions of attractive spinless fermions in a honeycomb lattice
arXiv:1006.3179 · doi:10.1209/0295-5075/93/37008
Abstract
We investigate a spinless Fermi gas trapped in a honeycomb optical lattice with attractive nearest-neighbor interactions. At zero temperature, mean-field theory predicts three quantum phase transitions, two being topological. At low interactions, the system is semi-metallic. Increasing the interaction further, the semi-metal destabilizes into a fully gapped superfluid. At larger interactions, a topological transition occurs and this superfluid phase becomes gapless, with Dirac-like dispersion relations. Finally, increasing again the interaction, a second topological transition occurs and the gapless superfluid is replaced by a different fully gapped superfluid phase. We analyze these different quantum phases as the temperature and the lattice filling are varied.
6 pages, 5 figures
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- On the coexistence of antiferromagnetism and d + i d superconducting correlations in the graphene bilayer
- Proximity effects in cold atom artificial graphene
- Comment on "Topological quantum phase transitions of attractive spinless fermions in a honeycomb lattice" by Poletti D. et al
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- Entanglement spectra of superconductivity ground states on the honeycomb lattice
- Synthesis of Majorana mass terms in low-energy quantum systems
- Topological phase transition based on the attractive Hubbard model