Spin-up of a superfluid vortex lattice driven by rough boundaries
Year: 2020
Authors: Keepfer N., Stagg, G. W., Galantucci L., Barenghi CF., Parker NG
Autors Affiliation: 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.
Journal/Review: PHYSICAL REVIEW B
Volume: 102 (14) Pages from: 144520-1 to: 144520-11
More Information: N.P., L.G., and C.F.B. acknowledge support from the Engineering and Physical Sciences Research Council (Grant No. EP/R005192/1).KeyWords: SPATIAL-DISTRIBUTION; QUANTIZED VORTICES; HE-4; DYNAMICS; VISUALIZATION; NUCLEATION; MOTIONS; HELIUMDOI: 10.1103/PhysRevB.102.144520ImpactFactor: 4.036Citations: 3data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-06References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here