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Article overview
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Re-entrant Pseudogap in Population Imbalanced Fermi Superfluids | | Madhuparna Karmakar
; Pinaki Majumdar
; | | Date: |
3 Aug 2015 | | Abstract: | In a Fermi superfluid increasing population imbalance leads initially to
reduction of the transition temperature, then the appearance of modulated
Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states, and finally the suppression of
pairing itself. For interaction strength such that the ’balanced’ system has a
normal state pseudogap, increasing imbalance leads to counterintuitive spectral
behavior. At a fixed weak imbalance (small polarization) the stable homogeneous
superfluid occurs only above a certain temperature and is pseudogapped. On
heating, the spectral character changes to gapped then pseudogapped again. At
large imbalance the ground state is FFLO and ’pseudogapped’ due to the
modulated order. It changes to a gapless normal state on heating, and then
shows a pseudogap at even higher temperature. We establish these re-entrant
features by using a Monte Carlo technique on large lattices, explain them in
terms of the pairing field, and compare them to spectroscopic results in the
imbalanced unitary Fermi gas. | | Source: | arXiv, 1508.0398 | | Services: | Forum | Review | PDF | Favorites | |
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