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

Abstract

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 wide 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.

7 pages, 3 figures; published version

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Cited by in corpus (10)

• Phase diagram of dipolar bosons in 2D with tilted polarization
• Quantum phase transition of a two-dimensional quadrupolar system
• Dipolar condensates with tilted dipoles in a pancake-shaped confinement
• Higher-order effective interactions for bosons near a two-body zero crossing
• Exotic roton excitations in quadrupolar Bose-Einstein condensates
• Thermally activated local collapse of a flattened dipolar condensate
• Density-wave-type supersolid of two-dimensional tilted dipolar bosons
• Tilted dipolar bosons in the quasi-two-dimensional regime: From liquid stripes to droplets
• Finite temperature instabilities of 2D dipolar Bose gas at arbitrary tilt angle
• Excitations and anisotropic sound in planar dipolar supersolids with tilted dipoles