The first microscopic ab initio calculation of the excitation spectrum of a vacancy in solid He-4 is reported. The energy-wave vector dispersion relation has been obtained at melting density within a development of the shadow wave function variational technique. The calculation of the excitation spectrum of a vacancy gives a bandwidth which ranges from 6 to 10 K in the hcp solid He-4, depending on the particular direction of the wave vector of the excitation. The effective mass of the vacancy turns out to be about 0.35 He-4 masses. We have also computed the spectrum of longitudinal phonons and we find rather good agreement with recent experimental results.

Vacancy excitation spectrum in solid He-4 and longitudinal phonons / D. E. Galli, L. Reatto. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 90:17(2003), pp. 175301.1-175301.4.

Vacancy excitation spectrum in solid He-4 and longitudinal phonons

D. E. Galli
Primo
;
L. Reatto
2003

Abstract

The first microscopic ab initio calculation of the excitation spectrum of a vacancy in solid He-4 is reported. The energy-wave vector dispersion relation has been obtained at melting density within a development of the shadow wave function variational technique. The calculation of the excitation spectrum of a vacancy gives a bandwidth which ranges from 6 to 10 K in the hcp solid He-4, depending on the particular direction of the wave vector of the excitation. The effective mass of the vacancy turns out to be about 0.35 He-4 masses. We have also computed the spectrum of longitudinal phonons and we find rather good agreement with recent experimental results.
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/189550
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