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Anomalous pseudogap in population imbalanced Fermi superfluids

  • Madhuparna KarmakarEmail author
  • Pinaki Majumdar
Regular Article

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.

Graphical abstract

Keywords

Cold Matter and Quantum Gas 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Harish-Chandra Research InstituteAllahabadIndia
  2. 2.Homi Bhabha National Institute, Training School ComplexMumbaiIndia

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