Can Angular Oscillations Probe Superfluidity in Dipolar Supersolids?

authored by: Matthew A. Norcia, Elena Poli, Claudia Politi, Lauritz Klaus, Thomas Bland, Manfred J. Mark, Luis Santos, Russell N. Bisset, Francesca Ferlaino
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.
Organisation(s): Institute of Theoretical Physics
External Organisation(s): Institute for Quantum Optics and Quantum Information (IQOQI)
University of Innsbruck
Type: Article
Journal: Physical review letters
Volume: 129
ISSN: 0031-9007
Publication date: 22.07.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Physics and Astronomy
Electronic version(s): https://doi.org/10.48550/arXiv.2111.07768 (Access: Open)
https://doi.org/10.1103/PhysRevLett.129.040403 (Access: Closed)

BibTeX

@article{e8b09ccd7828418dbfd59bc96e6b9d7f,
title = "Can Angular Oscillations Probe Superfluidity in Dipolar Supersolids?",
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.",
author = "Norcia, {Matthew A.} and Elena Poli and Claudia Politi and Lauritz Klaus and Thomas Bland and Mark, {Manfred J.} and Luis Santos and Bisset, {Russell N.} and Francesca Ferlaino",
note = "Funding Information: We thank Sandro Stringari and Alessio Recati for useful discussions. We acknowledge R. M. W. van Bijnen for developing the code for our EGPE ground-state simulations. The experimental team is financially supported through an ERC Consolidator Grant (RARE, Grant No. 681432), an NFRI grant (MIRARE, Grant No. {\"O}AW0600) of the Austrian Academy of Science, the QuantERA grant MAQS by the Austrian Science Fund FWF Grant No. I4391-N. L. S. and F. F. acknowledge the DFG/FWF via Grant No. FOR 2247/PI2790. L. S. acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy—Grant No. EXC-2123 QuantumFrontiers—390837967. M. A. N. has received funding as an ESQ Postdoctoral Fellow from the European Union{\textquoteright}s Horizon 2020 Research and Innovation Programme under the Marie Sk{\l}odowska Curie Grant Agreement No. 801110 and the Austrian Federal Ministry of Education, Science and Research (BMBWF). M. J. M. acknowledges support through an ESQ Discovery Grant by the Austrian Academy of Sciences. We also acknowledge the Innsbruck Laser Core Facility, financed by the Austrian Federal Ministry of Science, Research, and Economy. Part of the computational results presented have been achieved using the HPC infrastructure LEO of the University of Innsbruck.",
year = "2022",
month = jul,
day = "22",
doi = "10.48550/arXiv.2111.07768",
language = "English",
volume = "129",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "4",
}