We have computed the excitation spectrum of transverse phonons in bcc solid 4He near the melting density with the shadow wave function technique. The representation of a transverse phonon is obtained by taking the wave vector of the excitation operator (a density fluctuation written in terms of the shadow variables) as a combination of a reciprocal lattice vector and a wave vector orthogonal to ; in this way one is able to compute almost pure transverse phonon excitation energies when is not too large. The computed transverse phonon frequencies are in good agreement with recent experimental results.
Transverse phonon frequencies in bcc solid 4He / G. Mazzi, D.E. Galli, L. Reatto (AIP CONFERENCE PROCEEDINGS). - In: Low temperature physics / [a cura di] Y. Takano, S. P. Hershfield, S. O. Hill, P. J. Hirschfeld and A. M. Goldman. - [s.l] : AIP, 2006. - ISBN 0735403473. - pp. 354-355 (( Intervento presentato al 24. convegno International Conference on Low Temperature Physics - LT24 tenutosi a Orlando nel 2005.
Transverse phonon frequencies in bcc solid 4He
D.E. GalliSecondo
;L. ReattoUltimo
2006
Abstract
We have computed the excitation spectrum of transverse phonons in bcc solid 4He near the melting density with the shadow wave function technique. The representation of a transverse phonon is obtained by taking the wave vector of the excitation operator (a density fluctuation written in terms of the shadow variables) as a combination of a reciprocal lattice vector and a wave vector orthogonal to ; in this way one is able to compute almost pure transverse phonon excitation energies when is not too large. The computed transverse phonon frequencies are in good agreement with recent experimental results.File | Dimensione | Formato | |
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