One- and two-dimensional Bose-Einstein condensation of atoms in dark magneto-optical lattices

Abstract

The motion of atoms in a dark magneto-optical lattice is considered. This lattice is formed by a non-uniformly polarized laser field in the presence of a static magnetic field. Cold atoms are localized in the vicinity of points where dark states are not destroyed by a magnetic field. As a result the optical interaction tends to zero (dark or gray lattices). Depending on the field configuration such a lattice can exhibit one or two-dimensional periodicity. It is shown that in 1D and 2D dark magneto-optical lattices the effects connected with the Bose-statistics of particles can be observed under the temperature 10 −5 − 10 −6 K and densities 10 11 − 10 12 cm −3 , those are usual for current experiments on laser cooling.

Free expansion of a Bose-Einstein condensate in a one-dimensional optical lattice

“…The properties of Bose-Einstein condensates (BECs) in lower-dimensional trapping potentials have recently attracted increasing interest. Both theoretical and experimental investigations have been aimed at studying the differences between 1D [1][2][3][4][5][6][7] and 2D traps [8][9][10][11][12][13][14]4,6,7] with regard to the static and dynamic behaviour of BECs in such potentials. A thorough understanding of these properties is important as a prerequisite for predicting, e.g., the evolution of a BEC loaded into 1D and 2D waveguides.…”