he lattice dynamics of hcp crystalline (4)He is studied at zero temperature and for two different densities (near and far from melting), using a ground-state path-integral quantum Monte Carlo technique. The complete phonon dispersion is obtained, with particular attention to the separation of optic and acoustic branches and to the identification of transverse modes. Our study also sheds light on the residual coherence affecting quasiparticle excitations in the intermediate momentum region, in between the phonon and nearly free-particle regimes.
Zero-temperature dynamics of solid (4)He from quantum Monte Carlo simulations / Carleo, G.; Moroni, S.; Baroni, S.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 80:9(2009), pp. 1-8. [10.1103/PhysRevB.80.094301]
Zero-temperature dynamics of solid (4)He from quantum Monte Carlo simulations
Carleo, G.;Moroni, S.;Baroni, S.
2009-01-01
Abstract
he lattice dynamics of hcp crystalline (4)He is studied at zero temperature and for two different densities (near and far from melting), using a ground-state path-integral quantum Monte Carlo technique. The complete phonon dispersion is obtained, with particular attention to the separation of optic and acoustic branches and to the identification of transverse modes. Our study also sheds light on the residual coherence affecting quasiparticle excitations in the intermediate momentum region, in between the phonon and nearly free-particle regimes.| File | Dimensione | Formato | |
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