Bose condensates with strong anisotropic interaction

Chien Liu, B. D. Buschi, Zachary Dutton +1 more

Christopher Ticknor, Ryan Wilson, John L. Bohn

We study the superfluid character of a dipolar Bose-Einstein condensate (DBEC) in a quasi-two dimensional geometry. We consider the dipole polarization to have some nonzero projection into the plane of the condensate so that the effective interaction is anisotropic in this plane, yielding an anisotropic dispersion relation. By performing direct numerical simulations of a probe moving through the DBEC, we observe the sudden onset of drag or creation of vortex-antivortex pairs at critical velocities that depend strongly on the direction of the probe's motion. This anisotropy emerges because of the anisotropic manifestation of a rotonlike mode in the system.

Asaad R. Sakhel, Jonathan L. DuBois, H. R. Glyde

Maciej Lewenstein

A Bose-Einstein condensate (BEC) can dramatically collapse and explode when the interactions between the atoms are sufficiently strong and attractive. Now, scientists have imaged the anisotropic, clover-leaf shape of such a collapsing gas when the attractive atomic interactions are strongly dipolar.

Moritz Schutte

Ding Xiong, Huang Guoqiang, Cui-Lan Luo