Bose-Einstein supersolid phase for a novel type of momentum dependent interaction

Details Bose-Einstein supersolid phase for a novel type of momentum dependent interaction Bose-Einstein supersolid phase for a novel type of momentum dependent interaction

2010-05-21

arxiv.org/abs/1005.4027v3

Phys. Rev. A 83, 021602(R) (2011)

Physics

Condensed Matter

Quantum Gases

4 pages 3 figures, fig 1 and fig 2 updated

Scientific paper

10.1103/PhysRevA.83.021602

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.

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