TY - JOUR

T1 - Can Angular Oscillations Probe Superfluidity in Dipolar Supersolids?

AU - Norcia, Matthew A.

AU - Poli, Elena

AU - Politi, Claudia

AU - Klaus, Lauritz

AU - Bland, Thomas

AU - Mark, Manfred J.

AU - Santos, Luis

AU - Bisset, Russell N.

AU - Ferlaino, Francesca

N1 - 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. ÖAW0600) 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’s Excellence Strategy—Grant No. EXC-2123 QuantumFrontiers—390837967. M. A. N. has received funding as an ESQ Postdoctoral Fellow from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska 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.

PY - 2022/7/22

Y1 - 2022/7/22

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85135550442&partnerID=8YFLogxK

U2 - 10.48550/arXiv.2111.07768

DO - 10.48550/arXiv.2111.07768

M3 - Article

VL - 129

JO - Physical review letters

JF - Physical review letters

SN - 0031-9007

IS - 4

M1 - 040403

ER -