Confinement versus deconfinement of Cooper pairs in one-dimensional spin-3/2 fermionic cold atoms

S. Capponi; G. Roux; P. AzariaE. BoulatP. Lecheminant

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Confinement versus deconfinement of Cooper pairs in one-dimensional spin-3/2 fermionic cold atoms

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摘要

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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《Physical review, B. Condensed matter and materials physics》 |2007年第10期|100503R.1-100503R.4|共4页
作者
S. Capponi; G. Roux; P. AzariaE. BoulatP. Lecheminant;
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作者单位

Laboratoire de Physique Theorique, Universite Paul Sabatier, CNRS, 118 Route de Narbonne, 31400 Toulouse, France;

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正文语种英语
中图分类固体物理学;
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other topics in quantum fluids and solids; liquid and solid helium (restricted to new topics in section 67); fermion systems and electron gas; degenerate fermi gases; lattice fermion models (hubbard model; etc.);

Confinement versus deconfinement of Cooper pairs in one-dimensional spin-3/2 fermionic cold atoms

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