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- Mount Stromlo ObservatoryAU71 papers
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14 papers · 1 filter
Quantum fluctuations in trapped time-dependent Bose-Einstein condensates
Michael Uhlmann
Quantum fluctuations in time-dependent, harmonically-trapped Bose-Einstein condensates are studied within Bogoliubov theory. An eigenmode expansion of the linear field operators pe…
Directional spatial structure of dissociated elongated molecular condensates
Magnus Ögren, C. M. Savage, K. V. Kheruntsyan
Ultra-cold clouds of dimeric molecules can dissociate into quantum mechanically correlated constituent atoms that are either bosons or fermions. We theoretically model the dissocia…
A quasi-monomode guided atom-laser from an all-optical Bose-Einstein condensate
A. Couvert, M. Jeppesen, T. Kawalec +3
We report the achievement of an optically guided and quasi-monomode atom laser, in all spin projection states ( -1, 0 and ) of F=1 in Rubidium 87. The atom laser source…
Effect of fluctuations on the superfluid-supersolid phase transition on the lattice
Ralf Schützhold, Michael Uhlmann, Uwe R. Fischer
We derive a controlled expansion into mean field plus fluctuations for the extended Bose-Hubbard model, involving interactions with many neighbors on an arbitrary periodic lattice,…
Bogoliubov theory of quantum correlations in the time-dependent Bose-Hubbard model
Uwe R. Fischer, Ralf Schützhold, Michael Uhlmann
By means of an adapted mean-field expansion for large fillings , we study the evolution of quantum fluctuations in the time-dependent Bose-Hubbard model, starting in the sup…
Quantum-field dynamics of expanding and contracting Bose-Einstein condensates
S. Wuester, B. J. Dabrowska-Wuester, S. M. Scott +2
We analyze the dynamics of quantum statistics in a harmonically trapped Bose-Einstein condensate, whose two-body interaction strength is controlled via a Feshbach resonance. From a…