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Title
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Polaronic properties of an ion in a Bose-Einstein condensate in the strong-coupling limit
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Author
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Abstract
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| Cold atoms can be used to model the Fröhlich polaron Hamiltonian using an impurity in a condensate. To probe the strong-coupling regime (which remains elusive in the solid state) charged impurities can be better suited that neutral impurities. However, the ionatom interaction leads to a stronger depletion of the condensate as compared to the depletion from interaction with neutral impurities, and a good correspondence between the Fröhlich Hamiltonian and the cold atom system is only possible when the Bogoliubov approximation is valid. We use a strong-coupling variational approach to estimate an upper limit to the ion-atom coupling strength (expressed through a dimensionless coupling constant). The all-coupling path integral approach is used to estimate the values of the coupling constant that would need to be reached to probe the strong-coupling polaron physics. From these two approaches, we identify a regime where ions in condensates can model strong-coupling polarons and we calculate ground state properties in this regime. |
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Language
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English
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Source (journal)
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Journal of low temperature physics. - New York
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Publication
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New York
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2011
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ISSN
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0022-2291
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Volume/pages
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162
:3/4
(2011)
, p. 266-273
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ISI
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000286108200023
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Full text (Publisher's DOI)
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