Phase separation and vortex states in binary mixture of Bose-Einstein condensates in the trapping potentials with displaced centers
S. T. Chui, V. N. Ryzhov+ , E. E. Tareyeva+
Bartol Research Institute, University of Delaware, Newark, DE 19716
+Institute for High Pressure Physics, RAS, 142190 Troitsk, Moscow reg., Russia
PACS: 03.75.Fi, 67.57.Fg, 67.90.+z
Abstract
The system of two simultaneously
trapped codensates consisting of 87Rb atoms in two different
hyperfine states is investigated theoretically in the case when the minima of
the trapping potentials are displaced with respect to each other.
It is shown that the small shift of the minima
of the trapping potentials leads to the
considerable displacement of the centers of mass of the
condensates, in agreement with the experiment.
It is also
shown that the critical angular velocities of the vortex states of the system
drastically depend on the shift and
the relative number of particles in the condensates, and
there is a possibility
to exchange the vortex states between condensates by shifting the
centers of the trapping potentials.