Exploració per autor "Rota, Riccardo"
Ara es mostren els items 3-9 de 9
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High-order time expansion path integral ground state
Rota, Riccardo; Casulleras Ambrós, Joaquín; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (2010-01)
Article
Accés obertThe 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 obertWe 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'editorialWe 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 obertSeveral 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 obertWe 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 obertMolecular 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 obertWe 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 ...