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|Title:||Topological quantum phase transitions of attractive spinless fermions in a honeycomb lattice|
|Source:||Poletti, D., Miniatura, C., Grémaud, B. (2011-02). Topological quantum phase transitions of attractive spinless fermions in a honeycomb lattice. EPL 93 (3) : -. ScholarBank@NUS Repository. https://doi.org/93/37008|
|Abstract:||We investigate a spinless Fermi gas trapped in a honeycomb optical lattice with attractive nearest-neighbor interactions. At zero temperature, the 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. Copyright © EPLA, 2011.|
|Appears in Collections:||Staff Publications|
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