Polarization-induced phase separation and re-entrant transition of two-component fermions in a one-dimensional lattice

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Abstract

By investigating the compressibility of one-dimensional lattice fermions at various filling factors, we study the phase separation and re-entrant transition within the framework of the Bethe ansatz method. We model the system using the repulsive Hubbard model and calculate compressibility as a function of polarization for arbitrary values of chemical potential, temperature, and interaction strength. For filling factors 0<n<1, compressibility is a nonmonotonic function of polarization at all thermodynamic parameters. The compressibility reveals a phase transition into a phase-separated state for both low and intermediate temperatures at intermediate interactions as one increases the polarization. For certain filling factors, we find the re-entrant transition into the mixed phase at a higher polarization.

Original languageEnglish (US)
Article number053627
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume91
Issue number5
DOIs
StatePublished - May 27 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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