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Rotons and Supersolids in ultracold quantum gases of highly magnetic atoms

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If you have a question about this talk, please contact Dr Hannah Price.

Ultracold quantum gases realize an exquisite platform to study few- and many-body quantum phenomena. The achievement of quantum degeneracy in gases of atoms possessing large magnetic dipole moments has opened up new research directions where long-range anisotropic dipole-dipole interactions are competing with short-range contact interactions. Within the last few years, thanks to a fine control of this interaction competition and the subsequent occurrence of a unique stabilization mechanism based on quantum fluctuations, experiments using magnetic lanthanide atoms proved novel many-body quantum states. These include liquid-like droplets, roton excitations and, most recently, supersolids. In my talk, I will present recent results of my group in relation to the discovery and exploration of such states using gases of erbium and dysprosium in cigar- shaped traps with transverse magnetization. In the case of a regular superfluid state, the anisotropic dipole-dipole interaction may induce the existence of roton excitations along the cigar axis. The softening of these excitations under the reduction of the contact interaction strength drives a transition to density modulated states, stabilized by quantum fluctuations. The transition is relatively smooth, and, in an intermediate regime of interaction parameter, the superfluid order is maintained in the density-modulated ground-state, yielding a supersolid. In this paradoxical state, both crystal and phase excitations can come at play, yielding intriguing properties and dynamical behaviors.

This talk is part of the Theoretical Physics Seminars series.

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