Excitations in few-atomic-layer adsorbed helium films: The two-dimensional roton

Journal Article · Mon Jan 28 04:00:00 EST 1980 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.44.266· OSTI ID:5660816

Thomlinson, W; Tarvin, J A; Passell, L

Inelastic neutron scattering from helium adsorbed on Graphon indicates the presence of two types of excitations: one bulklike, which appears to be associated with the normal density part of the film; and a second, at lower energy, which is thought to originate in the high-density liquid layer immediately adjacent to the solid layers of the film. The latter is believed to be responsible for the reduced roton gap inferred from bulk studies of few-atomic-layer superfluid films.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• DOE Contract Number: EY-76-C-02-0016
• OSTI ID: 5660816
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 44:4; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORPTION
BARYONS
CARBON
ELEMENTARY PARTICLES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
FERMIONS
FILMS
FLUIDS
GRAPHITE
HADRONS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
INELASTIC SCATTERING
ISOTOPES
LIGHT NUCLEI
LINE WIDTHS
NEUTRONS
NONMETALS
NUCLEI
NUCLEONS
QUANTUM FLUIDS
QUASI PARTICLES
ROTONS
SCATTERING
SORPTION
STABLE ISOTOPES
TWO-DIMENSIONAL CALCULATIONS
ULTRALOW TEMPERATURE