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Population imbalanced lattice fermions near the BCS-BEC crossover: I.The breached pair and metastable FFLO phases | Madhuparna Karmakar
; Pinaki Majumdar
; | Date: |
3 Aug 2015 | Abstract: | We study s-wave superconductivity in the two dimensional attractive Hubbard
model in an applied magnetic field, assume the extreme Pauli limit, and examine
the role of spatial fluctuations in the coupling regime corresponding to
BCS-BEC crossover. We establish the full thermal phase diagram of this strong
coupling problem, revealing $T_c$ scales an order of magnitude below the mean
field estimate, highlight the spontaneous inhomogeneity in the field induced
magnetization, and discover a strong non monotonicity in the temperature
dependence of the low energy density of states. We compare our results to the
experimental phase diagram of the imbalanced Fermi gas at unitarity. This paper
focuses on the magnetized but homogeneous (breached pair) superconducting
state, a companion paper deals with the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)
regime. | Source: | arXiv, 1508.0393 | Services: | Forum | Review | PDF | Favorites |
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