Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 28: Poster Session - Atomic Physics IV
A 28.32: Poster
Thursday, March 12, 2020, 16:00–18:00, Empore Lichthof
Supersolid states in dipolar quantum gases — •Gabriele Natale1, Lauriane Chomaz1, Daniel Petter1, Alexander Patscheider1, Rick van Bijnen2, Manfred Mark1,2, and Francesca Ferlaino1,2 — 1Institut fuer Experimentalphysik, Universitaet Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria — 2Institut fuer Quantenoptik und Quanteninformation, Technikerstraße 21a, 6020 Innsbruck, Austria
In the last years, experiments using highly magnetic lanthanide atoms proved the existence of novel many-body quantum states, e.g. quantum droplets and dipolar supersolids. When confined in a cigar-shaped trap, quantum gases show intriguing behaviors. The excitation spectrum of the regular superfluid can develop a roton mode. When the roton mode becomes unstable, new phases can be stabilized against collapse by quantum fluctuations. We explore the steady-state behavior of an erbium quantum gas in this regime and observe a supersolid state exhibiting a density modulation with global phase coherence. In follow-up work, we investigate the spectrum of elementary excitations across the superfluid supersolid phase transition. Theoretically, we show that, when entering the supersolid phase, two distinct excitation branches appear, associated with dominant crystal and superfluid character, respectively. Experimentally, we probe compressional excitations across the phase diagram. While in the Bose-Einstein condensate regime the system exhibits an ordinary quadrupole oscillation, in the supersolid regime we observe a striking two-frequency response of the system, related to the two spontaneously broken symmetries.