Rotons in gaseous Bose-Einstein condensates irradiated by a laser.
A gaseous Bose-Einstein condensate irradiated by a far off-resonance laser has long-range interatomic correlations caused by laser-induced dipole-dipole interactions. These correlations, which are tunable via the laser intensity and frequency, can produce a "roton" minimum in the excitation spectrum--behavior reminiscent of the strongly correlated superfluid liquid He II.
O'Dell
D H J
DH
Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.
Giovanazzi
S
S
Kurizki
G
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