Using modified Gaussian distribution to study the physical properties of one and two-component ultracold atoms

Physics – Condensed Matter – Other Condensed Matter

Scientific paper

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7 pages, 7 figures, accepted for publication in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.75.023609

Gaussian distribution is commonly used as a good approximation to study the trapped one-component Bose-condensed atoms with relatively small nonlinear effect. It is not adequate in dealing with the one-component system of large nonlinear effect, nor the two-component system where phase separation exists. We propose a modified Gaussian distribution which is more effective when dealing with the one-component system with relatively large nonlinear terms as well as the two-component system. The modified Gaussian is also used to study the breathing modes of the two-component system, which shows a drastic change in the mode dispersion at the occurrence of the phase separation. The results obtained are in agreement with other numerical results.

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