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Q: Fachverband Quantenoptik und Photonik
Q 22: Ultracold Matter (Bosons) II (joint session Q/A)
Q 22.2: Vortrag
Dienstag, 11. März 2025, 11:15–11:30, HS I PI
Dipolar supersolid in a toroidal trap — •Paul Uerlings1, Kevin Ng1, Fiona Hellstern1, Alexandra Köpf1, Michael Wischert1, Tanishi Verma1, Philipp Stürmer2, Koushik Mukherjee2, Jens Hertkorn4, Stephan Welte3, Ralf Klemt1, Stephanie Reimann2, and Tilman Pfau1 — 15. Physikalisches Institut and Center for Integrated Quantum Science and Technology IQST, Universität Stuttgart — 2Division of Mathematical Physics and NanoLund, LTH, Lund University — 35. Physikalisches Institut and Center for Integrated Quantum Science and Technology IQST and QPhoton,Universität Stuttgart — 4Department of Physics, MIT
A supersolid is a phase of matter that combines the ordered, periodic density modulation of a solid with the frictionless flow of a superfluid, simultaneously breaking both the global U(1) gauge symmetry and the translational symmetry. This symmetry breaking gives rise to three types of collective excitations: the first and second-sound branch and the amplitude Higgs modes. In harmonic traps the Higgs excitations couples strongly to other modes making it hard to detect experimentally. In this work, we theoretically explore the excitation spectrum of a dipolar quantum gas trapped in a toroidal trap. In contrast to previous studies in a harmonic confinement. Our findings reveal decoupled sound and amplitude modes. In the low-momentum limit we find an isolated and massive Higgs excitation. We show how we can selectively excite individual modes of the supersolid. In order to observe these excitations experimentally, we prepare an ultracold gas of 162Dy atoms in a tunable toroidal trap.
Keywords: supersolid; dysprosium; ultracold; dipolar; BEC