Open AccessPairing gaps in atomic gases at the BCS–BEC crossover
Author(s) -
H. Heiselberg
Publication year - 2004
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/6/1/137
Subject(s) - pairing , physics , quasiparticle , superfluidity , excitation , semiclassical physics , crossover , condensed matter physics , atomic physics , bcs theory , coupling (piping) , fermi gas , quantum mechanics , superconductivity , mechanical engineering , artificial intelligence , computer science , engineering , quantum , electron
Strong evidence for pairing and superfluidity has recently been found inatomic Fermi gases at the BCS-BEC crossover both in collective modes and RFexcitation energies. It is argued that the scale for the effective pairing gapsmeasured in RF experiments is set by the lowest quasiparticle in-gap excitationenergies. These are calculated at the BCS-BEC crossover from semiclassicalsolutions to the Bogoliubov-deGennes equations. The strong damping of theradial breathing mode observed in the BCS limit occur when the lowestquasiparticle excitation energies coincide with the radial frequency, whichindicates that a coupling between them take place.Comment: revised version: including damping, resonance position typo correcte
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