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Anomalous pseudogap in population imbalanced Fermi superfluids

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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. We have carried out a detailed investigation of the spectral behavior of the imbalanced Fermi system and observe intriguing subgap features in the low polarization regime, and a re-entrant pseudogap state at large polarization. These weak imbalance and strong imbalance features both involve effects well beyond mean field theory. We establish them by using a Monte Carlo technique on large lattices, motivate the results in terms of the pairing field distribution, and compare them to spectroscopic results in the imbalanced unitary Fermi gas.

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Authors and Affiliations

  1. Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, 211 019, Allahabad, India

    Madhuparna Karmakar & Pinaki Majumdar

  2. Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, 400085, Mumbai, India

    Madhuparna Karmakar & Pinaki Majumdar

Authors
  1. Madhuparna Karmakar
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  2. Pinaki Majumdar
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Correspondence to Madhuparna Karmakar.

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Karmakar, M., Majumdar, P. Anomalous pseudogap in population imbalanced Fermi superfluids. Eur. Phys. J. D 70, 220 (2016). https://doi.org/10.1140/epjd/e2016-70250-2

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  • DOI: https://doi.org/10.1140/epjd/e2016-70250-2

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