Physics – Condensed Matter – Superconductivity
Scientific paper
2004-09-14
Phys. Rev. B 70, 184513 (2004).
Physics
Condensed Matter
Superconductivity
5 pages, 3 figures; to appear in Phys Rev B
Scientific paper
10.1103/PhysRevB.70.184513
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 lithium or potassium 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 there a sound wave like structure for wave vectors above a certain q_{min}(T) where they practically coincide there with the spectrum of the superfluid phase for T
Domanski Tadeusz
Ranninger Julius
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