Recent progress in the theory of rotons in superfluid [sup 4]He

Conference · Wed Dec 01 04:00:00 EST 1993 · Journal of Low Temperature Physics; (United States)

OSTI ID:5344050

Reatto, L; Vitiello, S A; Masserini, G L ^[1]

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1. Universita degli Studi di Milano (Italy)

The excitation spectrum of superfluid [sup 4]He is discussed on the basis of a shadow wave function. The potential and kinetic energies of the excitations are computed at different densities. The theory has been extended at finite temperature and the authors obtain the roton contribution to the radial distribution function, to the depletion of the condensate and to the dynamical structure factor S(q,[omega]). The authors present also the first realistic microscopic computation of the roton energy at finite T. Possible role of thermally excited vortices on rotons is considered. With a simple model the authors show that some discrepancies between the linewidth of the roton response in neutron and in Raman scattering can be resolved.

• OSTI ID: 5344050
• Report Number(s): CONF-9308208--
• Conference Information: Journal Name: Journal of Low Temperature Physics; (United States) Journal Volume: 93:5-6
• Country of Publication: United States
• Language: English

Related Subjects

665420* -- Superfluidity-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
FUNCTIONS
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
NUCLEI
QUASI PARTICLES
ROTONS
STABLE ISOTOPES
STRUCTURE FUNCTIONS
SUPERFLUIDITY