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Title
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Landau phonon-roton theory revisited for superfluid and fermi gases
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Author
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Abstract
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| Liquid helium and spin-1/2 cold-atom Fermi gases both exhibit in their superfluid phase two distinct types of excitations, gapless phonons and gapped rotons or fermionic pair-breaking excitations. In the long wavelength limit, revising and extending the theory of Landau and Khalatnikov initially developed for helium [Zh. Exp. Teor. Fiz. 19, 637 (1949)], we obtain universal expressions for three-and four-body couplings among these two types of excitations. We calculate the corresponding phonon damping rates at low temperature and compare them to those of a pure phononic origin in high-pressure liquid helium and in strongly interacting Fermi gases, paving the way to experimental observations. |
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Language
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English
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Source (journal)
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Physical review letters. - New York, N.Y., 1958, currens
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Publication
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New York, N.Y.
:
American Physical Society
,
2017
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ISSN
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0031-9007
[print]
1079-7114
[online]
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DOI
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10.1103/PHYSREVLETT.119.260402
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Volume/pages
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119
:26
(2017)
, 6 p.
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Article Reference
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260402
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ISI
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000418661700001
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Pubmed ID
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29328691
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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