Interplay between exotic superfluidity and magnetism in a chain of four-component ultracold atoms

E. Szirmai, G. Barcza, J. Sólyom, Legeza

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4 Citations (Scopus)

Abstract

We investigate the spin-polarized chain of ultracold alkaline-earth-metal atoms with spin-3/2 described by the fermionic Hubbard model with SU(4) symmetric attractive interaction. The competition of bound pairs, trions, quartets, and unbound atoms is studied analytically and by density-matrix renormalization-group simulations. We find several distinct states where bound particles coexist with the ferromagnetic state of unpaired fermions. In particular, an exotic inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-type superfluid of quartets in a magnetic background of uncorrelated atoms is found for weaker interactions. We show that the system can be driven from this quartet-FFLO state to a molecular state of localized quartets where spatial segregation between molecular crystals and ferromagnetic liquids emerges, and this transition is reflected in the static structure factor.

Original languageEnglish
Article number013610
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume95
Issue number1
DOIs
Publication statusPublished - Jan 12 2017

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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