6 research outputs found
Solitons in coupled atomic-molecular Bose-Einstein condensates in a trap
We consider coupled atomic-molecular Bose-Einstein condensate system in a
quasi-one-dimensional trap. In the vicinity of a Feshbach resonance the system
can reveal soliton-like behavior. We analyze bright soliton solutions for the
system in the trap and in the presence of the interactions between particles.
We show that with increasing number of particles in the system two bright
soliton solutions start resembling dark soliton profiles known in an atomic
Bose-Einstein condensate with repulsive interactions between atoms. We analyze
also methods for experimental preparation and detection of the soliton states.Comment: 7 pages, 7 figures, published versio
Amphibian decline in a Central European forest and the importance of woody debris for population persistence
N-conserving Bogoliubov vacuum of a two-component Bose-Einstein condensate : density fluctuations close to a phase-separation condition
Two-component Bose-Einstein condensates are considered within a number
conserving version of the Bogoliubov theory. We show that the Bogoliubov vacuum
state can be obtained in the particle representation in a simple form. We
predict considerable density fluctuations in finite systems close to the
phase-separation regime. We analyze homogeneous condensates and condensates in
a double-well potential.Comment: 12 pages, 5 figures, published versio