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arXiv · 1505.07026

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

Theja N. De Silva
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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 non-monotonic 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.

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Theja N. De Silva. 2015-05-26. Polarization-induced phase separation and re-entrant transition of two component-fermions in a one-dimensional lattice. https://doi.org/10.1103/physreva.91.053627

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