Quasiparticles, coherence, and nonlinearity

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Journal Title
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2008-08-01
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Degree programme
Language
en
Pages
4
1-4
Series
PHYSICAL REVIEW A, Volume 78, issue 2
Abstract
We consider rf spectroscopy of ultracold Fermi gases by exact simulations of the many-body state and the coherent dynamics in one dimension. Deviations from the linear response sum rule result are found to suppress the pairing contribution to the rf line shifts. We compare the coherent rotation and quasiparticle descriptions of rf spectroscopy which are analogous to NMR experiments in superfluid He3 and tunneling in solids, respectively. We suggest that rf spectroscopy in ultracold gases provides an interesting crossover between these descriptions that could be used for studying decoherence in quantum measurement, in the context of many-body quantum states.
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Leskinen , M , Apaja , V , Kajala , J & Törmä , P 2008 , ' Quasiparticles, coherence, and nonlinearity : Exact simulations of RF-spectroscopy of strongly interacting one-dimensional Fermi gases ' , Physical Review A , vol. 78 , no. 2 , 023602 , pp. 1-4 . https://doi.org/10.1103/PhysRevA.78.023602