Third sound, two-dimensional hydrodynamics, and elementary excitations in very thin helium films

Journal Article · Fri Sep 01 04:00:00 EDT 1978 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.18.2155· OSTI ID:6919930

Rutledge, J E; McMillan, W L; Mochel, J M; Washburn, T E

High-precision measurements of third-sound velocity in /sup 4/He films with surface densities between 0.16 and 5.25 atomic layers have been taken between 0.1 and 1.5 K. By reformulating Landau's quantum hydrodynamics in two dimensions we have been able to accurately describe these measurements in terms of a surface phonon and surface roton branch of the elementary excitation spectrum. In the thin-film limit surface tension falls to zero and the surface rotons are characterized by the energy gap of 5.3 K.

• Research Organization: Physics Department and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
• OSTI ID: 6919930
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 18:5; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
EVEN-EVEN NUCLEI
FILM FLOW
FILMS
FLUID FLOW
FLUID MECHANICS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
HYDRODYNAMICS
ISOTOPES
LIGHT NUCLEI
MECHANICS
NUCLEI
PHONONS
QUASI PARTICLES
ROTONS
STABLE ISOTOPES
SUPERFLUIDITY
THIRD SOUND