Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-06-16
EuroPhysics. Lett. 93, 37008 (2011)
Physics
Condensed Matter
Quantum Gases
6 pages, 5 figures
Scientific paper
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.
Grémaud Benoît
Miniatura Christian
Poletti Dario
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