Rotons and Quantum Evaporation from Superfluid 4He

Abstract

The probability of evaporation induced by $R^{+}$ and $R^{-}$ rotons at the surface of superfluid helium is calculated using time dependent density functional theory. We consider excitation energies and incident angles such that phonons do not take part in the scattering process. We predict sizable evaporation rates, which originate entirely from quantum effects. Results for the atomic reflectivity and for the probability of the roton change-mode reflection are also presented.

11 pages, REVTEX, 3 figures available upon request or at http://anubis.science.unitn.it/~dalfovo/papers/papers.html

References in corpus (2)

• Structural and dynamical properties of superfluid helium: a density functional approach
• Dispersion of Ripplons in Superfluid 4he

Cited by in corpus (9)

• Wetting transitions of He4 on alkali metal surfaces from density functional calculations
• Quantum sticking, scattering and transmission of 4He atoms from superfluid 4He surfaces
• Quantum Evaporation from the Free Surface of Superfluid 4He
• Dynamics of liquid He-4 in confined geometries from Time-Dependent Density Functional calculations
• Adiabatic Output Coupling of a Bose Gas at Finite Temperatures
• Quantized conductance through the quantum evaporation of bosonic atoms
• Evaporative cooling to a Rydberg crystal close to its ground state
• Quantum Evaporation from Superfluid Helium at Normal Incidence
• Asymmetry and nonlinearity of current-bias characteristics in superfluid-normal state junctions of weakly-interacting Bose gases