Rotating a Supersolid Dipolar Gas

Year: 2020

Authors: Roccuzzo SM., Recati A., Stringari S.

Autors Affiliation: Univ Trento, CNR, INO, BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; INFN, Trento Inst Fundamental Phys & Applicat, I-38123 Trento, Italy.

Abstract: Distinctive features of supersolids show up in their rotational properties. We calculate the moment of inertia of a harmonically trapped dipolar Bose-Einstein condensed gas as a function of the tunable scattering length parameter, providing the transition from the (fully) superfluid to the supersolid phase and eventually to an incoherent crystal of self-bound droplets. The transition from the superfluid to the supersolid phase is characterized by a jump in the moment of inertia, revealing its first order nature. In the case of elongated trapping in the plane of rotation, we show that the moment of inertia determines the value of the frequency of the scissors mode, which is significantly affected by the reduction of superfluidity in the supersolid phase. The case of an in-plane isotropic trapping is instead well suited to study the formation of quantized vortices, which are shown to be characterized, in the supersolid phase, by a sizeable deformed core, caused by the presence of the surrounding density peaks.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 124 (4)      Pages from: 045702-1  to: 045702-6

More Information: Stimulating discussions with Francesca Ferlaino, Giacomo Lamporesi, Giovanni Modugno, Tilman Pfau, and Luca Tanzi are acknowledged. This project received funding from the European Union´s Horizon 2020 research and innovation programme under Grant No. 641122 “QUIC”, from Provincia Autonoma di Trento, the Q@TN initiative and the FISh project of the Istituto Nazionale diFisica Nucleare.
KeyWords: SCISSORS MODE; SUPERFLUIDITY
DOI: 10.1103/PhysRevLett.124.045702

Citations: 66
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