Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 162, Issue 3-4, Pages 266-273Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-010-0286-0
Keywords
Polarons; Bose-Einstein condensate
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Funding
- FWO-V [G. 0180.09N, G. 0115.06, G. 0356.06, G. 0370.09N]
- WOG Belgium [WO. 033.09N]
- University of Antwerp, BOF NOI UA
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Cold atoms can be used to model the Frohlich 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 ion-atom 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 Frohlich 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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