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arXiv · 0706.3143

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

T. Stauber·J. Ranninger
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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 $g \leq g_c$ 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.

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T. Stauber, J. Ranninger. 2007-06-21. First Order Superfluid to Bose Metal Transition in Systems with Resonant Pairing. https://doi.org/10.1103/physrevlett.99.045301

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