Bose-Einstein supersolid phase for a novel type of momentum dependent interaction
arXiv:1005.4027 · doi:10.1103/PhysRevA.83.021602
Abstract
A novel class of non-local interactions between bosons is found to favor a crystalline Bose-Einstein condensation ground state. By using both low energy effective field theory and variational wavefunction method, we compare this state not only with the homogeneous superfluid, as has been done previously, but also with the normal (non-superfluid) crystalline phase and obtain the phase diagram. The key characters are: the interaction potential displays a negative minimum at finite momentum which determines the wavevector of this supersolid phase; and the wavelength corresponding to the momentum minimum needs to be greater than the mean inter-boson distance.
4 pages 3 figures, fig 1 and fig 2 updated
References in corpus (8)
- Ultracold heteronuclear molecules in a 3D optical lattice
- Fragmentation of Bose-Einstein Condensates
- Ultracold dense gas of deeply bound heteronuclear molecules
- A superfluid-droplet crystal and a free-space supersolid in a dipole-blockaded gas
- Cold polar molecules in 2D traps: Tailoring interactions with external fields for novel quantum phases
- Stability of quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions
- What makes a crystal supersolid ?
- Stability of the density-wave state of a dipolar condensate in a pancake trap