Sound, Superfluidity, and Layer Compressibility in a Ring Dipolar Supersolid

Year: 2024

Authors: Sindik M., Zawislak T., Recati A., Stringari S.

Autors Affiliation: Univ Trento, Pitaevskii BEC Ctr, CNR INO, Via Sommar 14, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, Via Sommar 14, I-38123 Trento, Italy.

Abstract: We propose a protocol to excite the Goldstone modes of a supersolid dipolar Bose-Einstein condensed gas confined in a ring geometry. By abruptly removing an applied periodic modulation proportional to cos ( phi ) , where phi is the azimuthal angle, we explore the resulting oscillations of the gas by solving the extended Gross-Pitaevskii equation. The value of the two longitudinal sound velocities exhibited in the supersolid phase are analyzed using the hydrodynamic theory of supersolids at zero temperature, which explicitly takes into account both the superfluid and the crystal nature of the system. This approach allows for the determination of the layer compressibility modulus as well as of the superfluid fraction, f S , in agreement with the Leggett estimate of the nonclassical moment of inertia.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 132 (14)      Pages from: 146001-1  to: 146001-7

More Information: We are grateful to Wilhelm Zwerger for many illuminating comments concerning the hydrodynamic model for supersolids when applied to configurations with density modulation along a single direction. Stimulating discussions with Giovanni Modugno and William Phillips are also acknowledged. We acknowledge support from the Provincia Autonoma di Trento, the Q@TN (the joint lab between University of Trento, FBK-Fondazione Bruno Kessler, INFN-National Institute for Nuclear Physics and CNR-National Research Council), the Italian MIUR under the PRIN2017 project CEnTraL (Protocol Number 20172H2SC4), and from the CINECA through the award under the ISCRA initiative, for the availability of HPC resources.
KeyWords: supersolid phase
DOI: 10.1103/PhysRevLett.132.146001

Citations: 3
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