We compute the self energy and lifetimes of a 4He atom coupled to the phonon field of a graphite substrate. The substrate phonons are calculated in the continuum elastic approximation, with appropriate boundary conditions at the surface. The energy shift of the ground state amounts to ≈.5°K at zero temperature. Lifetimes are of the order of 10-10 sec. The main contribution is due to the mixed modes of the substrate.
HE-4-PHONON INTERACTION ON A GRAPHITE SUBSTRATE
ANCILOTTO, FRANCESCO;TOIGO, FLAVIO
1983
Abstract
We compute the self energy and lifetimes of a 4He atom coupled to the phonon field of a graphite substrate. The substrate phonons are calculated in the continuum elastic approximation, with appropriate boundary conditions at the surface. The energy shift of the ground state amounts to ≈.5°K at zero temperature. Lifetimes are of the order of 10-10 sec. The main contribution is due to the mixed modes of the substrate.
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