Excitation spectrum of a /sup 3/He atom moving in He II at zero temperature

Journal Article · Mon Jan 01 04:00:00 EST 1979 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.19.206· OSTI ID:6196991

Goetze, W; Luecke, M; Szprynger, A

The recoil spectrum S (q,..omega..) for a single /sup 3/He moving in He II at zero temperature is calculated within a mode-coupling approximation. The effective mass of the /sup 3/He particle is found to be m* = 2.35m/sub 3/. The dispersion curve for elementary excitations is shown to deviate considerably from a parabolic one yielding a higher density of states for energies near the He II roton gap. The undamped quasiparticle excitations cease to exist for a momentum about 2 A/sup -1/; their excitation strength drops to zero. The dispersion curve continues above 2 A/sup -1/ as a resonance in the multiple-excitation background.

• Research Organization: Max-Planck-Institut fuer Physik und Astrophysik, 8000 Muenchen, and Physik-Department der Technischen Universitaet Muenchen, 8046 Garching, Germany
• OSTI ID: 6196991
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 19:1; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSOLUTE ZERO TEMPERATURE
EFFECTIVE MASS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITATION
FLUIDS
HELIUM 3
HELIUM 4
HELIUM II
HELIUM ISOTOPES
IMPURITIES
ISOTOPES
LIGHT NUCLEI
LINEAR MOMENTUM TRANSFER
MASS
MOMENTUM TRANSFER
NUCLEI
QUANTUM FLUIDS
QUASI PARTICLES
ROTONS
STABLE ISOTOPES
SUPERFLUIDITY