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Q: Fachverband Quantenoptik und Photonik
Q 26: Ultracold atoms, ions, and BEC IV (joint session A/Q)
Q 26.2: Vortrag
Mittwoch, 11. März 2020, 11:30–11:45, f303
The low-energy Goldstone mode in a trapped dipolar supersolid — •Mingyang Guo1, Fabian Böttcher1, Jens Hertkorn1, Jan-Niklas Schmidt1, Matthias Wenzel1, Hans Peter Büchler2, Tim Langen1, and Tilman Pfau1 — 15. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Stuttgart, Germany — 2Institute for Theoretical Physics III and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Stuttgart, Germany
A supersolid is a counter-intuitive state of matter that combines the frictionless flow of a superfluid with the crystal-like periodic density modulation of a solid, simultaneously breaking the global gauge symmetry and translational symmetry. Although predicted more than 50 years ago, it is only recently that its defining properties are observed in ultracold quantum gases.
In this talk, I will focus on the realization of a supersolid state with a self-organized array of dipolar quantum droplets, where the crystallization arises owing to intrinsic interactions within the Dysprosium atoms. Besides the periodic density modulation and global phase coherence, the low-energy Goldstone mode, associated directly to the two broken symmetries, is observed. The dynamics of this mode features an out-of-phase oscillation of the crystal array and the superfluid density while keeping the center-of-mass constant. This mode exists only as a result of the phase rigidity of the state, and therefore confirms the superfluidity of the realized supersolid.