Static response function for longitudinal and transverse excitations in superfluid helium

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.13991· OSTI ID:6889252

Dalfovo, F; Stringari, S ^[1]

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1. Dipartimento di Fisica, Universita di Trento, I-38050 Povo (Italy)

The sum-rule formalism is used to evaluate rigorous bounds for the density and current static response functions in superfluid [sup 4]He at zero temperature. Both lower and upper bounds are considered. The bounds are expressed in terms of ground-state properties (density and current correlation functions) and of the interatomic potential. The results for the density static response significantly improve the Feynman approximation and turn out to be close to the experimental (neutron scattering) data. A quantitative prediction for the transverse current response is given. The role of one-phonon and multiparticle excitations in the longitudinal and transverse channels is discussed.

• OSTI ID: 6889252
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:21; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665420* -- Superfluidity-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CORRELATION FUNCTIONS
DENSITY
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
FUNCTIONS
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
PHYSICAL PROPERTIES
RESPONSE FUNCTIONS
STABLE ISOTOPES
SUPERFLUIDITY