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Title: Topological quantum phase transitions of attractive spinless fermions in a honeycomb lattice
Authors: Poletti, D.
Miniatura, C. 
Grémaud, B. 
Issue Date: Feb-2011
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.
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.
Source Title: EPL
ISSN: 02955075
DOI: 93/37008
Appears in Collections:Staff Publications

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