Quantum sticking, scattering and transmission of 4He atoms from superfluid 4He surfaces

Details Quantum sticking, scattering and transmission of 4He atoms from superfluid 4He surfaces Quantum sticking, scattering and transmission of 4He atoms from superfluid 4He surfaces

1998-02-03

arxiv.org/abs/cond-mat/9802036v2

Physics

Condensed Matter

Scientific paper

10.1103/PhysRevLett.80.2169

We develop a microscopic theory of the scattering, transmission, and sticking of 4He atoms impinging on a superfluid 4He slab at near normal incidence, and inelastic neutron scattering from the slab. The theory includes coupling between different modes and allows for inelastic processes. We find a number of essential aspects that must be observed in a physically meaningful and reliable theory of atom transmission and scattering; all are connected with multiparticle scattering, particularly the possibility of energy loss. These processes are (a) the coupling to low-lying (surface) excitations (ripplons/third sound) which is manifested in a finite imaginary part of the self energy, and (b) the reduction of the strength of the excitation in the maxon/roton region.

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