Confinement versus deconfinement of Cooper pairs in one-dimensional spin-3∕2 fermionic cold atoms
S. Capponi, G. Roux, P. Azaria, E. Boulat, P. Lecheminant
DOI 10.1103/PhysRevB.75.100503 · Physical Review B
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Abstract
The phase diagram of spin-3∕2 fermionic cold atoms trapped in a one-dimensional optical lattice is investigated at quarter filling (one atom per site) by means of large-scale numerical simulations. In full agreement with a recent low-energy approach, we find two phases with confined and deconfined Cooper pairs separated by an Ising quantum phase transition. The leading instability in the confined phase is an atomic-density wave with subdominant quartet superfluid instability made of four fermions. Finally, we reveal the existence of a bond-ordered Mott insulating phase in some part of the repulsive regime.
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