We study theoretically the interaction between two species of ultracold atoms confined in two layers of a finite separation and demonstrate the existence of confinement-induced interlayer bound and quasibound molecules: These excitonlike interlayer molecules appear for both positive and negative scattering lengths and exist even for layer separations many times larger than the interspecies scattering length. The lifetime of the quasibound molecules grows exponentially with increasing layer separation and the molecules can therefore be observed in simple shaking experiments, as we demonstrate through detailed many-body calculations. These quasibound molecules can also give rise to interspecies Feshbach resonances, enabling one to control geometrically the interaction between the two species by changing the layer separation. Rather counterintuitively, the species can be made strongly interacting, by actually increasing their spatial separation. The separation-induced interlayer resonances provide a powerful tool for the experimental control of interspecies interactions and enables one to realize novel quantum phases of multicomponent quantum gases.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - márc. 16 2015|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics