,

Ground-state properties and superfluidity of two- and quasi-two-dimensional solid 4He,

J. Phys.: Condens. Matter 22, 165402 (2010) [journal][abstract]

*In a recent study we have reported a new type of trial wavefunction symmetric under the exchange of particles, which is able to describe a supersolid phase. In this work, we use the diffusion Monte Carlo method and this model wavefunction to study the properties of solid 4He in two- and quasi-two-dimensional geometries. In the purely two-dimensional (2D) case, we obtain results for the total ground-state energy and freezing and melting densities which are in good agreement with previous exact Monte Carlo calculations performed with a slightly different interatomic potential model. We calculate the value of the zero-temperature superfluid fraction ρs/ρ of 2D solid 4He and find that it is negligible in all the considered cases, similarly to what is obtained in the perfect (free of defects) three-dimensional crystal using the same computational approach. Interestingly, by allowing the atoms to move locally in the direction perpendicular to the plane where they are confined to zero-point oscillations (quasi-2D crystal), we observe the emergence of a finite superfluid density that coexists with the periodicity of the system.*

.bib
@ARTICLE{CCazorla-Groun-2010,

author = {C. Cazorla and G. E. Astrakharchik and J. Casulleras and J. Boronat},

title = {Ground-state properties and superfluidity of two- and quasi-two-dimensional solid 4He},

journal = {J. Phys.: Condens. Matter},

volume = {22},

pages = {165402},

year = {2010}

}

CVN
*AUTORES/AS (p.o. de firma)*: C. Cazorla, G. E. Astrakharchik, J. Casulleras, J. Boronat

*TITULO*: Ground-state properties and superfluidity of two- and quasi-two-dimensional solid 4He

*REF REVISTA/LIBRO*: J. Phys.: Condens. Matter **22**, 165402

*CLAVE*: A

*FECHA PUBLICACION (*)*: 2010