Strong-coupling polarons in dilute gas Bose-Einstein condensates.
A neutral impurity atom immersed in a dilute Bose-Einstein condensate (BEC) can have a bound ground state in which the impurity is self-localized. In this polaronlike state, the impurity distorts the density of the surrounding BEC, thereby creating the self-trapping potential minimum. We describe the self-localization in a strong-coupling approach.
Cucchietti
F M
FM
T-4, Theory Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Timmermans
E
E