Density pattern in supercritical flow of liquid He-4
Authors: Ancilotto F., Dalfovo F., Pitaevskii L., Toigo F.
Autors Affiliation: INFM (Udr Padova and DEMOCRITOS National Simulation Center, Trieste, Italy) and Dipartimento di Fisica “G. Galilei,” Università di Padova, via Marzolo 8, I-35131 Padova, Italy
BEC-INFM, Istituto Nazionale per la Fisica della Materia, Trento, Italy
Dipartimento di Fisica, Università di Trento, 38050 Povo, Italy
Kapitza Institute for Physical Problems, ul. Kosygina 2, 117334 Moscow, Russia
Abstract: A density-functional theory is used to investigate the instability arising in superfluid He-4 as it flows at velocity u just above the Landau critical velocity of rotons v(c). Confirming an early theoretical prediction by one of us [JETP Lett. 39, 511 (1984)], we find that a stationary periodic modulation of the density occurs, with amplitude proportional to (u-v(c))(1/2) and wave vector equal to the roton wave vector. This density pattern is studied for supercritical flow both in bulk helium and in a channel of nanometer cross section.
Journal/Review: PHYSICAL REVIEW B
Volume: 71 (10) Pages from: 104530 to: 104530
KeyWords: SuperfluidityDOI: 10.1103/PhysRevB.71.104530Citations: 22data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2022-06-19References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here