First Order Superfluid to Bose Metal Transition in Systems with Resonant Pairing

Abstract

Systems showing resonant superfluidity, driven by an exchange coupling of strength $g$ between uncorrelated pairs of itinerant fermions and tightly bound ones, undergo a first order phase transition as $g$ increases beyond some critical value $g_c$. The superfluid phase for $g\le g_c$ is characterized by a gap in the fermionic single particle spectrum and an acoustic sound-wave like collective mode of the bosonic resonating fermion pairs inside this gap. For $g>g_c$ this state gives way to a phase uncorrelated bosonic liquid with a $q^2$ spectrum.

5 pages, 3 figures

References in corpus (2)

• From an insulating to a superfluid pair-bond liquid
• Resonating bipolarons

Cited by in corpus (2)

• Boson-Fermion Duality and Metastability in Cuprate Superconductors
• Local dynamical lattice instabilities: Prerequisites for resonant pairing superconductivity