Collective excitation frequencies of a Bose - Einstein condensate with electromagnetically induced $1/r$ attraction

摘要

We investigate collective excitations of an atomic Bose-Einstein condensatein a recently discovered regime [D.O'Dell et al., Phys. Rev. Lett. 84, 5687(2000)] of a balance between electromagnetically induced $1/r$ attraction and ashort-range interatomic repulsion. The corresponding frequencies for monopole,dipole, and quadrupole modes are calculated numerically in the zero temperaturecase.