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Path integral Monte Carlo calculation of momentum distribution in solid He-4
Rota, Riccardo; Boronat Medico, Jordi
Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada
We perform calculations of the momentum distribution n(k) in solid 4He by means of path integral Monte Carlo methods.We see that, in perfect crystals, n(k)does not depend on temperature T and that is different from the classical Gaussian shape of the Maxwell-Boltzmann distribution, even though these discrepancies decrease when the density of the system increases. In crystals presenting vacancies, we see that for T ≥ 0.75 K, n(k) presents the same behavior as in the perfect crystal, but, at lower T , it presents a peak when k→0.
Peer Reviewed
-Àrees temàtiques de la UPC::Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria
-Àrees temàtiques de la UPC::Física::Física de l'estat sòlid
-Supersolids
-Bose-Einstein condensation
-Path integral Monte Carlo
-Momentum distribution
-Supersòlids
Article - Submitted version
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