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TRIONIC AND QUARTETTING PHASES IN ONE-DIMENSIONAL MULTICOMPONENT ULTRACOLD FERMIONS

P. Lecheminant, P. Azaria, E. Boulat +3 more

We investigate the possible formation of a molecular condensate, which might be, for instance, the analogue of the alpha condensate of nuclear physics, in the context of multicomponent cold atoms fermionic systems. A simple paradigmatic model of N-component fermions with contact interactions loaded into a one-dimensional optical lattice is studied by means of low-energy and numerical approaches. For attractive interaction, a quasi-long-range molecular superfluid phase, formed from bound-states made of N fermions, emerges at low density. We show that trionic and quartetting phases, respectively for N = 3,4, extend in a large domain of the phase diagram and are robust against small symmetry-breaking perturbations.We investigate the possible formation of a molecular condensate, which might be, for instance, the analogue of the alpha condensate of nuclear physics, in the context of multicomponent cold atoms fermionic systems. A simple paradigmatic model of N-component fermions with contact interactions loaded into a one-dimensional optical lattice is studied by means of low-energy and numerical approaches. For attractive interaction, a quasi-long-range molecular superfluid phase, formed from bound-states made of N fermions, emerges at low density. We show that trionic and quartetting phases, respectively for N = 3,4, extend in a large domain of the phase diagram and are robust against small symmetry-breaking perturbations.

arXiv:0806.2556International Journal of Modern Physics ENov 1, 20088 citations

Topological phases and phase transitions in a two-dimensional fermionic lattice

C. Morais Smith, Wouter Beugeling, Nathan Goldman

Bulletin of the American Physical SocietyFeb 27, 20120 citations

THE GROUNDSTATES AND PHASES OF THE TWO-DIMENSIONAL FULLY FRUSTRATED XY MODEL

Petter Minnhagen, Sebastian Bernhardsson, Beom Jun Kim

The 2D Fully Frustrated XY(FFXY) class of models is shown to contain a new groundstate in addition to the checkerboard groundstate of the standard 2D XY model. The spin configuration of this additional groundstate is obtained and its connection to a broken Z2-symmetry explained. This means that the class of 2D FFXY models belongs within a U(1) ⊗ Z2 ⊗ Z2-symmetry phase-transition representation. The phase diagram is reviewed and the central charges of the four multicritical points described. The implications for the standard 2D FFXY-model are discussed and elucidated, in particular with respect to the long standing controversy concerning the phase transitions of the standard 2D FFXY-model.The 2D Fully Frustrated XY(FFXY) class of models is shown to contain a new groundstate in addition to the checkerboard groundstate of the standard 2D XY model. The spin configuration of this additional groundstate is obtained and its connection to a broken Z2-symmetry explained. This means that the class of 2D FFXY models belongs within a U(1) ⊗ Z2 ⊗ Z2-symmetry phase-transition representation. The phase diagram is reviewed and the central charges of the four multicritical points described. The implications for the standard 2D FFXY-model are discussed and elucidated, in particular with respect to the long standing controversy concerning the phase transitions of the standard 2D FFXY-model.

International Journal of Modern Physics BAug 20, 20090 citations

Designer Dirac fermions and topological phases in molecular graphene

Kenjiro K. Gomes, Warren Mar, Wonhee Ko +2 more

NatureMar 1, 2012741 citations

Topological Phases of Interacting Fermions in Optical Lattices

V. W. Scarola, Chuanchang Zeng, Tudor D. Stanescu +2 more

Bulletin of the American Physical SocietyMar 3, 20200 citations

TOPOLOGICAL PHASES OF COLD ATOMS IN OPTICAL SUPERLATTICE

Fuyuki Matsuda

Nov 24, 20200 citations

TWO-DIMENSIONAL DIRAC FERMIONS IN Z2 TOPOLOGICAL PHASES

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