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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster – Ultra-cold Atoms, Ions and BEC (joint session A/Q)

Q 27.9: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Excitation spectrum of a double supersolid in a trapped dipolar Bose mixture — Daniel Scheiermann¹, •Albert Gallemi², and Luis Santos³ — ¹Leibniz Universität Hannover — ²Leibniz Universität Hannover — ³Leibniz Universität Hannover

Dipolar Bose-Einstein condensates constitute an excellent platform for the study of supersolidity, characterized by the coexistence of density modulation and superfluidity. The realization of dipolar mixtures opens intriguing new scenarios, most remarkably the possibility of observing a double supersolid, composed by two coexisting interacting miscible supersolids with different superfluidity. We analyze the rich excitation spectrum of a miscible trapped dipolar Bose mixture, showing that it provides key insights about the double supersolid regime. This regime may be in particular probed experimentally by monitoring the apperance of doublets of superfluid compressional modes, linked to the different superfluid character of each component. Moreover, the two-fluid character results in a non-trivial nature of the roton excitations, as well as of the Higgs and low-lying Goldstone modes.

Keywords: Supersolid; BEC; Dipolar Bose-Einstein condensate; Excitation spectrum; Bogoliubov-de Gennes Equations