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- Title
BOSE–EINSTEIN CONDENSATION AND EXCITATIONS IN SOLID [sup 4]He WITH VACANCIES.
- Authors
Galli, D. E.; Reatto, L.
- Abstract
We have studied the ground state and excited state properties of solid [sup 4]He on the basis of the variational shadow wave function technique (SWF), which allows for relaxation and delocalisation of vacancies. We have found that a finite concentration of vacancies, if present, induces Bose-Einstein condensation (BEC) of the atoms at density close to the T=0 K melting where vacancies are delocalised. No BEC is present in a perfect crystal or in a defected solid at higher densities. We have extended this technique to study longitudinal phonons in solid [sup 4]He and to study the vacancy excitation at a finite momentum; we have been able to compute for the first time the vacancy excitation spectrum in solid [sup 4]He at density close to melting. Our results give a band width of about 8 K.
- Subjects
SOLID helium; SOLID rare gases; ENERGY levels (Quantum mechanics); WAVE functions; WAVE mechanics
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2003, Vol 17, Issue 28, p5243
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979203020387