Exploració per autor "Rota, Riccardo"

Ara es mostren els items 5-9 de 9

    • On the stability of small vacancy clusters in solid 4He 

      Lutsyshyn, Yaroslav; Rota, Riccardo; Boronat Medico, Jordi (2011-03)
      Article
      Accés restringit per política de l'editorial
      We study numerically properties of multiple vacancies in solid 4He at zero temperature. Up to four vacancies were introduced into the solid through incommensuration between the number of available lattice sites and the ...

    • Path Integral Monte Carlo and Bose-Einstein condensation in quantum fluids and solids 

      Rota, Riccardo (Universitat Politècnica de Catalunya, 2011-12-20)
      Tesi
      Accés obert
      Several microscopic theories point out that Bose-Einstein condensation (BEC), i.e., a macroscopic occupation of the lowest energy single particle state in many-boson systems, may appear also in quantum fluids and solids ...

    • Path integral Monte Carlo calculation of momentum distribution in solid He-4 

      Rota, Riccardo; Boronat Medico, Jordi (2011-02)
      Article
      Accés obert
      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 ...

    • Superfluidity of metastable glassy bulk para-hydrogen at low temperature 

      Osychenko, O.N.; Rota, Riccardo; Boronat Medico, Jordi (2012-06-13)
      Article
      Accés obert
      Molecular para-hydrogen has been proposed theoretically as a possible candidate for superfluidity, but the eventual superfluid transition is hindered by its crystallization. In this work, we study a metastable non ...

    • Temperature dependence of the vacancy formation energy in solid 4He 

      Rota, Riccardo; Boronat Medico, Jordi (Multidisciplinary Digital Publishing Institute (MDPI), 2018-09-01)
      Article
      Accés obert
      We studied the thermal effects on the behavior of incommensurate solid 4He at low temperatures using the path integral Monte Carlo method. Below a certain temperature, depending on the density and the structure of the ...