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 gc. The superfluid phase for g<or=gc 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>gc this state gives way to a phase-uncorrelated bosonic liquid with a q2 spectrum.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 gc. The superfluid phase for g<or=gc 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>gc this state gives way to a phase-uncorrelated bosonic liquid with a q2 spectrum.

arXiv:0706.3143Physical Review LettersJul 26, 20075 citations

Fermionic Paired Superfluids at High Rotation Rate

Martin Y. Veillette, Daniel E. Sheehy, Victor Gurarie +1 more

Bulletin of the American Physical SocietyMar 13, 20060 citations

Fermionic Superfluidity

WORLD SCIENTIFIC eBooksJul 1, 20100 citations

Remnant superfluid collective phase oscillations in the normal state of systems with resonant pairing

T. Domański, J. Ranninger

The signature of superfluidity in bosonic systems is a sound-wave-like spectrum of the single particle excitations which in the case of strong interactions is roughly temperature independent. In Fermionic systems, where Fermion pairing arises as a resonance phenomenon between free Fermions and paired Fermionic states (examples are: the atomic gases of $^{6}\mathrm{Li}$ or $^{40}\mathrm{K}$ controlled by a Feshbach resonance, polaronic systems in the intermediary coupling regime, $d$ -wave hole pairing in the strongly correlated Hubbard system), remnants of such superfluid characteristics are expected to be visible in the normal state. The single particle excitations maintain a sound-wave-like structure for wave vectors above a certain ${q}_{\mathrm{min}}(T)$ where they practically coincide there with the spectrum of the superfluid phase for $T<{T}_{c}$ . Upon approaching the transition from above this region in $q$ space extends down to small momenta, except for a narrow region around $q=0$ where such modes change into damped free particle like excitations.The signature of superfluidity in bosonic systems is a sound-wave-like spectrum of the single particle excitations which in the case of strong interactions is roughly temperature independent. In Fermionic systems, where Fermion pairing arises as a resonance phenomenon between free Fermions and paired Fermionic states (examples are: the atomic gases of $^{6}\mathrm{Li}$ or $^{40}\mathrm{K}$ controlled by a Feshbach resonance, polaronic systems in the intermediary coupling regime, $d$-wave hole pairing in the strongly correlated Hubbard system), remnants of such superfluid characteristics are expected to be visible in the normal state. The single particle excitations maintain a sound-wave-like structure for wave vectors above a certain ${q}_{\mathrm{min}}(T)$ where they practically coincide there with the spectrum of the superfluid phase for $T<{T}_{c}$. Upon approaching the transition from above this region in $q$ space extends down to small momenta, except for a narrow region around $q=0$ where such modes change into damped free particle like excitations.

arXiv:cond-mat/0409359Physical Review BNov 16, 200410 citations

Fermionic Superfluidity: Cooper Pairing

Andreas Schmitt

Lecture notes in physicsJun 13, 20140 citations

^{6}\mathrm{Li}

^{40}\mathrm{K}

controlled by a Feshbach resonance, polaronic systems in the intermediary coupling regime,

d

-wave hole pairing in the strongly correlated Hubbard system), remnants of such superfluid characteristics are expected to be visible in the normal state. The single particle excitations maintain a sound-wave-like structure for wave vectors above a certain

{q}_{\mathrm{min}}(T)

where they practically coincide there with the spectrum of the superfluid phase for

T<{T}_{c}

. Upon approaching the transition from above this region in

q

space extends down to small momenta, except for a narrow region around

q=0

where such modes change into damped free particle like excitations.