Year: 2022
Type: article
Abstract: Angular oscillations can provide a useful probe of the superfluid properties of a system. Such measurements have recently been applied to dipolar supersolids, which exhibit both density modulation and phase coherence, and for which robust probes of superfluidity are particularly interesting. So far, these investigations have been confined to linear droplet arrays, which feature relatively simple excitation spectra, but limited sensitivity to the effects of superfluidity. Here, we explore angular oscillations in systems with 2D structure which, in principle, have greater sensitivity to superfluidity. In both experiment and simulation, we find that the interplay of superfluid and crystalline excitations leads to a frequency of angular oscillations that remains nearly unchanged even when the superfluidity of the system is altered dramatically. This indicates that angular oscillation measurements do not always provide a robust experimental probe of superfluidity with typical experimental protocols.
Source: Physical Review Letters
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Servicestelle für Mobilitätsprogramme des österreichischen Bundesministeriums für Bildung, Wissenschaft und Forschung, KulturKontakt Austria, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Österreichischen Akademie der Wissenschaften, Austrian Science Fund, Bundesministerium für Bildung, Wissenschaft und Forschung, Horizon 2020 Framework Programme, H2020 European Research Council, H2020 Marie Skłodowska-Curie Actions
OpenAlex ID: W3211615437