Density pattern in supercritical flow of liquid He-4

Year: 2005

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.


Volume: 71 (10)      Pages from: 104530  to: 104530

KeyWords: Superfluidity
DOI: 10.1103/PhysRevB.71.104530

Citations: 22
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