Bose-condensed states in 2D trapped gases

Markus Holzmann

Dmitry S. Petrov, Markus Holzmann, Gora V. Shlyapnikov

We discuss Bose-Einstein condensation (BEC) in quasi-2D trapped gases and find that well below the transition temperature T(c) the equilibrium state is a true condensate, whereas at intermediate temperatures T<T(c) one has a quasicondensate (condensate with fluctuating phase). The mean-field interaction in a quasi-2D gas is sensitive to the frequency omega(0) of the (tight) confinement in the "frozen" direction, and one can switch the sign of the interaction by changing omega(0). Variation of omega(0) can also reduce the rates of inelastic processes. This offers promising prospects for tunable BEC in trapped quasi-2D gases.

S. Giorgini, Лев П. Питаевский, S. Stringari

Hongwei Xiong, Shujuan Liu, Guoxiang Huang

The analytical probability distributions of the quasi-two-dimensional (quasi-2D) (and purely 2D) ideal and interacting Bose gases are investigated by using a canonical ensemble approach. Using the analytical probability distribution of the condensate, the statistical properties such as the mean occupation number and particle number fluctuations of the condensate are calculated. Research shows that there is a continuous crossover of the statistical properties from a quasi-2D to a purely 2D ideal gas or interacting gas. In contrast to the case of a 3D Bose gas, the interaction between atoms changes, in a deep way, the nature of the particle number fluctuations.

Mohamed K. Al-Sugheir, G.A. Alna'washi, H. B. Ghassib +1 more

Patrik Öhberg, E.L. Surkov, Ilkka Juhani Tittonen +3 more