Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 7: Ultracold Matter II – Bosons (joint session Q/A)

Q 7.3: Vortrag

Montag, 2. März 2026, 17:30–17:45, P 2

Dipolar supersolids in toroidal traps — •Paul Uerlings¹, Fiona Hellstern¹, Kevin Ng¹, Michael Wischert¹, Tim Jerglotz¹, Koushik Mukerjee², Malte Schubert², Stephan Welte^1,3, Ralf Klemt¹, Stephanie Reimann², and Tilman Pfau^1,3 — ¹5. Physikalisches Institut and Center for Integrated Quantum Science and Technology IQST, Universität Stuttgart — ²Division of Mathematical Physics and NanoLund, LTH, Lund University — ³CZS Center QPhoton

Supersolids formed from a dipolar BEC exhibit a spontaneous, periodic density modulation while maintaining the frictionless flow of a superfluid. This unique behavior results from breaking both the global U(1) gauge symmetry and the continuous translational symmetry, leading to three types of collective excitations: the first- and second-sound branches, along with amplitude (Higgs) modes. In harmonic traps, these Higgs-like excitations hybridize with other modes, making them difficult to observe experimentally. In this study, we theoretically investigate the excitation spectrum of a dipolar quantum gas of Dysprosium atoms confined in a toroidal trap. Our results reveal decoupled sound and amplitude-like modes. This allows us to study the time evolution and dispersion of a localized Higgs-like quasiparticle excitation. The quadratic dispersion of this quasiparticle, together with the periodic density modulation, leads to (fractional) revivals, similar to those observed in the optical Talbot effect. We also present our experimental work towards observing these excitations in-situ.

Keywords: supersolid; dipolar; BEC; quasiparticle; talbot