Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 28: Poster Session - Atomic Physics IV
A 28.22: Poster
Thursday, March 12, 2020, 16:00–18:00, Empore Lichthof
A trapped dipolar supersolid with atomic Dysprosium — •Kevin Ng1, Mingyang Guo1, Fabian Böttcher1, Jens Hertkorn1, Jan-Niklas Schmidt1, Hans Peter Büchler2, Tim Langen1, and Tilman Pfau1 — 15. Physikalisches Institut and Center for Integrated Quantum Science and Technology IQST, Universität Stuttgart — 2Institute for Theoretical Physics III and Center for Integrated Quantum Science and Technology IQST, Universität Stuttgart
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. Although first predicted to exist over 50 years ago, recent efforts to realize such a state have not exhibited propagating phonon modes. With a self-organized array of dipolar quantum droplets, we demonstrate the first true realization of a supersolid state, where global gauge symmetry and translational symmetry are simultaneously broken.
In our system, a periodic density modulation arises from intrinsic interactions between atoms. This, and in addition to global phase coherence, we observe the Goldstone mode associated with two broken translational symmetries. This low-energy mode, existing only as a consequence of superfluid stiffness, features an out-of-phase oscillation of the crystal array and the superfluid density while keeping the center-of-mass constant. At the phase transition between BEC and supersolid phases, we identify the low-energy Goldstone and Higgs amplitude modes as emerging from the softening roton modes of the dipolar BEC.