Exploració per autor "Rota, Riccardo"

Ara es mostren els items 1-9 de 9

    • Correlation properties of a one-dimensional repulsive Bose gas at finite temperature 

      Rosi, Giulia de; Rota, Riccardo; Astrakharchik, Grigori; Boronat Medico, Jordi (2023-04-05)
      Article
      Accés obert
      We present a comprehensive study shedding light on how thermal fluctuations affect correlations in a Bose gas with contact repulsive interactions in one spatial dimension. The pair correlation function, the static structure ...

    • Dark-soliton-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas [Dataset] 

      Rosi, Giulia de; Rota, Riccardo; Astrakharchik, Grigori; Boronat Medico, Jordi (Universitat Politècnica de Catalunya, 2021-10-05)
      Conjunt de dades
      Accés obert

    • High-order time expansion path integral ground state 

      Rota, Riccardo; Casulleras Ambrós, Joaquín; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (2010-01)
      Article
      Accés obert
      The feasibility of path integral Monte Carlo ground state calculations with very few beads using a high-order short-time Green’s function expansion is discussed. An explicit expression of the evolution operator which provides ...

    • Hole-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas 

      Rosi, Giulia de; Rota, Riccardo; Astrakharchik, Grigori; Boronat Medico, Jordi (2022-08-26)
      Article
      Accés obert
      We reveal an intriguing anomaly in the temperature dependence of the specific heat of a one-dimensional Bose gas. The observed peak holds for arbitrary interaction and remembers a superfluid-to-normal phase transition in ...

    • 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 ...