31 citations · 223 across the 21 of their papers we have counts for
5 papers · 1 filter
Elastic constants of hcp He: Path-integral Monte Carlo results versus experiment
Luis Aldemar Peña Ardila, Silvio A. Vitiello, Maurice de Koning
The elastic constants of hcp He are computed using the path-integral Monte Carlo (PIMC) method. The stiffness coefficients are obtained by imposing different distortions to a…
Kinetic energies of liquid and solid phases of He
E. J. Rugeles, Sebastian Ujevic, S. A. Vitiello
Kinetic energies of a system of He are investigated at zero temperature. The multi-weight extension to the diffusion Monte Carlo method is used to implement the Feynman-Hellman…
Elastic constants and supersolidity in solid hcp 4He
Renato Pessoa, M. de Koning, S. A. Vitiello
The elastic constants of solid \textit{hcp} He are investigated in molar volumes ranging from about melting up to approximately 14 MPa. Properties of interest are determined by…
Zero-point Divacancy Concentration in the Shadow Wave-Function Model for Solid 4He
R. Pessoa, M. de Koning, S. A. Vitiello
We address the issue of interaction between zero-point vacancies in solid 4He as described within the shadow wave-function model. Applying the reversible-work method and taking int…
Influence of Anharmonic Effects on the Zero-point Vacancy Concentration in Solid 4He
R. Pessoa, M. de Koning, S. A. Vitiello
We conduct a theoretical study in which we determine the zero-point vacancy concentration in solid 4He at T=0 K. To this end, we employ the quantum-classical isomorphism, by which…