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

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

2007-06-21

arxiv.org/abs/0706.3143v1

Phys. Rev. Lett. 99, 045301 (2007)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.045301

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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