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EPFL seminars
Universality and scale invariance in quasi-two-dimensional trapped Bose gases
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Europe/Zurich
Salle 727 du BSP (Cubotron) (EPFL)
Salle 727 du BSP (Cubotron)
EPFL
Description
I discuss quasi-two-dimensional Bose gases in harmonic traps at temperatures
close to the Kosterlitz-Thouless transition. Using Quantum Monte Carlo calculations we have studied density profiles, superfluid and condensate fractions, single-particle coherence, and pair correlations. From the density profile we obtain the equation of state which we compare directly with experimental measurements.
Quantitative comparisons with mean-field, and effective (classical) field theory allows us to study universal two-dimensional correlations in the fluctuation region, and to characterize the cross-over from Kosterlitz-Thouless to Bose-Einstein behavior for small particle numbers.
close to the Kosterlitz-Thouless transition. Using Quantum Monte Carlo calculations we have studied density profiles, superfluid and condensate fractions, single-particle coherence, and pair correlations. From the density profile we obtain the equation of state which we compare directly with experimental measurements.
Quantitative comparisons with mean-field, and effective (classical) field theory allows us to study universal two-dimensional correlations in the fluctuation region, and to characterize the cross-over from Kosterlitz-Thouless to Bose-Einstein behavior for small particle numbers.