Spin-up of a superfluid vortex lattice driven by rough boundaries

Anno: 2020

Autori: Keepfer N., Stagg, G. W., Galantucci L., Barenghi CF., Parker NG

Affiliazione autori: Newcastle Univ, Joint Quantum Ctr JQC Durham Newcastle, Sch Math Stat & Phys, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England; Univ Trento, INO CNR BEC Ctr, Dipartimento Fis, Via Sommar 14, I-38123 Trento, Italy

Abstract: We study numerically the formation of a vortex lattice inside a rotating bucket containing superfluid helium, paying attention to an important feature which is practically unavoidable in all experiments: the microscopic roughness of the bucket’s surface. We model this using the Gross-Pitaevskii equation for a weakly interacting Bose gas, a model which is idealized when applied to superfluid helium but captures the key physics of the vortex dynamics which we are interested in. We find that the vortex lattice arises from the interaction and reconnections of nucleated U-shaped vortex lines, which merge and align along the axis of rotation. We quantify the effects which the surface roughness and remanent vortex lines play in this process.

Giornale/Rivista: PHYSICAL REVIEW B

Volume: 102 (14)      Da Pagina: 144520-1  A: 144520-11

Maggiori informazioni: N.P., L.G., and C.F.B. acknowledge support from the Engineering and Physical Sciences Research Council (Grant No. EP/R005192/1).
Parole chiavi: SPATIAL-DISTRIBUTION; QUANTIZED VORTICES; HE-4; DYNAMICS; VISUALIZATION; NUCLEATION; MOTIONS; HELIUM
DOI: 10.1103/PhysRevB.102.144520

Citazioni: 3
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-14
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