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Regular version of the site

Article

Two-dimensional Bose gas of tilted dipoles: Roton instability and condensate depletion

Physical Review A: Atomic, Molecular, and Optical physics. 2014. Vol. 90. No. 4. P. 043616 .
Fedorov A. K., Kurbakov I. L., Shchadilova Y. E., Yu. E. Lozovik.

We predict the effect of the roton instability for a two-dimensional weakly interacting gas of tilted dipoles in a single homogeneous quantum layer. Being typical for strongly correlated systems, the roton phenomena appear to occur in a weakly interacting gas. It is important that in contrast to a system of normal to the layer dipoles, breaking of the rotational symmetry for a system of tilted dipoles leads to the convergence of the condensate depletion even up to the threshold of the roton instability, with mean-field approach being valid. Predicted effects can be observed in a wide class of dipolar systems. We suggest observing predicted phenomena for systems of ultracold atoms and polar molecules in optical lattices, and estimate optimal experimental parameters.