Ara es mostren els items 74-93 de 104

    • Second layer of H2 and D2 adsorbed on graphene 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (2013-04-03)
      Article
      Accés obert
      We report diffusion Monte Carlo calculations on the phase diagrams of para-H2 and ortho-D2 adsorbed on top of a first layer of the same substances on graphene. We found that the ground state of the second layer is a ...
    • Sharp crossover from composite fermionization to phase separation in microscopic mixtures of ultracold bosons 

      Garcia March, Miguel Angel; Julia Diaz, Bruno; Astrakharchik, Grigori; Busch, T; Boronat Medico, Jordi; Rios Polls, Artur (2013-12-03)
      Article
      Accés obert
      We show that a two-component mixture of a few repulsively interacting ultracold atoms in a one-dimensional trap possesses very diverse quantum regimes and that the crossover between them can be induced by tuning the ...
    • Simulation and understanding of atomic and molecular quantum crystals 

      Cazorla, Claudio; Boronat Medico, Jordi (2017-08-03)
      Article
      Accés obert
      Quantum crystals abound in the whole range of solid-state species. Below a certain threshold temperature the physical behavior of rare gases (4He and Ne), molecular solids (H2 and CH4), and some ionic (LiH), covalent ...
    • Single-particle versus pair superfluidity in a bilayer system of dipolar bosons 

      Macia Rey, Adrián; Astrakharchik, Grigori; Mazzanti Castrillejo, Fernando Pablo; Giorgini, Stefano; Boronat Medico, Jordi (2014-10-21)
      Article
      Accés obert
      We consider the ground state of a bilayer system of dipolar bosons, where dipoles are oriented by an external field in the direction perpendicular to the parallel planes. Quantum Monte Carlo methods are used to calculate ...
    • Solidification of small p-H(2) clusters at zero temperature 

      Sola, E.; Boronat Medico, Jordi (2011-06-30)
      Article
      Accés restringit per política de l'editorial
      We have determined the ground-state energies of para-H2 clusters at zero temperature using the diffusion Monte Carlo method. The liquid or solid character of each cluster is investigated by restricting the phase through ...
    • Spin-polarized hydrogen adsorbed on the surface of superfluid He-4 

      Marín, J. M.; Vranješ Markic, Leandra; Boronat Medico, Jordi (2013-12-14)
      Article
      Accés obert
      The experimental realization of a thin layer of spin-polarized hydrogen H double down arrow adsorbed on top of the surface of superfluid He-4 provides one of the best examples of a stable, nearly two-dimensional(2D) quantum ...
    • Squeezing Bose-Bose liquid drops 

      Sanuy i Latorre, Ares; Barac, Rocco; Stipanovic, Petar; Vranješ Markic, Leandra; Boronat Medico, Jordi (American Physical Society, 2024-01-16)
      Article
      Accés restringit per política de l'editorial
      We explore ultradilute Bose-Bose liquid droplets squeezed by an external harmonic potential in one spatial direction. Our theoretical study is based on a functional that is built using quantum Monte Carlo results of the ...
    • Structural superfluid-Mott-insulator transition for a Bose gas in multirods 

      Rodríguez López, Omar Abel; Boronat Medico, Jordi (American Physical Society, 2021-01-14)
      Article
      Accés obert
      We report on a structural superfluid–Mott-insulator (SF-MI) quantum phase transition for an interacting one-dimensional Bose gas within permeable multirod lattices, where the rod lengths are varied from zero to the lattice ...
    • Structure of halo and quasi-halo helium–helium–alkali trimers 

      Stipanovic, P.; Vranješ Markic, Leandra; Boronat Medico, Jordi (2017-05-01)
      Article
      Accés obert
      We report a diffusion Monte Carlo study of A4He2 and A4He3He trimers’ structural properties, were A is one of the alkali atoms 6,7Li, 23Na, 39K, 85Rb or 133Cs. Some of them are in a pure halo state, characterized by large ...
    • Superfluid and supersolid phases of He-4 on the second layer of graphite 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (American Institute of Physics (AIP), 2020-05-22)
      Article
      Accés obert
      We revisited the phase diagram of the second layer of 4He on top of graphite using quantum Monte Carlo methods. Our aim was to explore the existence of the novel phases suggested recently in experimental works, and determine ...
    • 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 ...
    • Supersolid striped droplets in a Raman spin-orbit-coupled system 

      Sánchez Baena, Juan; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (American Physical Society, 2020-11-09)
      Article
      Accés obert
      We analyze the role played by quantum fluctuations on a Raman spin-orbit-coupled system in the stripe phase under attractive interspin interactions. We show that beyond-mean-field effects stabilize the collapse predicted ...
    • Supersolid stripes enhanced by correlations in a Raman spin-orbit-coupled system 

      Sánchez Baena, Juan; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (American Physical Society (APS), 2020-04-01)
      Article
      Accés obert
      A Bose gas under the effect of Raman spin-orbit coupling (SOC) is analyzed using the discrete spin T-moves diffusion Monte Carlo method. Upon computing the energy as well as the static structure factor and the superfluid ...
    • Supersolidity in quantum films adsorbed on graphene and graphite 

      Gordillo Bargueño, Maria Carmen; Cazorla, C.; Boronat Medico, Jordi (2011-03-17)
      Article
      Accés obert
      Using quantum Monte Carlo we have studied the superfluid density of the first layer of 4He and H2 adsorbed on graphene and graphite. Our main focus has been on the equilibrium ground state of the system, which corresponds ...
    • Supersolidity in the second layer of para-H2 adsorbed on graphite 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (American Physical Society (APS), 2022-03-03)
      Article
      Accés restringit per política de l'editorial
      We calculated the phase diagram of the second layer of para-H2 adsorbed on graphite using quantum Monte Carlo methods. The second layer shows an incommensurate triangular crystal structure. By using a symmetric wave function, ...
    • 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 ...
    • The limit of mechanical stability in quantum crystals: a diffusion Monte Carlo study of solid He-4 

      Cazorla Silva, Claudio; Boronat Medico, Jordi (2015-07-01)
      Article
      Accés obert
      We present a first-principles study of the energy and elastic properties of solid helium at pressures below the range in which it is energetically stable. We find that the limit of mechanical stability in hcp He is bar, ...
    • Towards a quantum Monte Carlo-based density functional including finite-range effects: excitation modes of a K 39 quantum droplet 

      Cikojevic, Viktor; Vranješ Markic, Leandra; Pi Pericay, Martí; Barranco Gómez, Manuel; Boronat Medico, Jordi (American Physical Society, 2020-09-25)
      Article
      Accés obert
      Some discrepancies between experimental results on quantum droplets made of a mixture of 39K atoms in different hyperfine states and their analysis within extended Gross-Pitaevskii theory (which incorporates beyond mean-field ...
    • Trapped Bose-Bose mixtures at finite temperature: a quantum Monte Carlo approach 

      Dželalija, K.; Cikojevic, V.; Boronat Medico, Jordi; Vranješ Markic, Leandra (American Physical Society, 2020-12-04)
      Article
      Accés obert
      We study thermal properties of a trapped Bose-Bose mixture in a dilute regime using quantum Monte Carlo methods. Our main aim is to investigate the dependence of the superfluid density and the condensate fraction on ...
    • Two-dimensional mixture of dipolar fermions: Equation of state and magnetic phases 

      Comparin, Tommaso; Bombín Escudero, Raul; Holzmann, Markus; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi; Giorgini, Stefano (American Physical Society (APS), 2019-04-08)
      Article
      Accés obert
      We study a two-component mixture of fermionic dipoles in two dimensions at zero temperature, interacting via a purely repulsive 1/r3 potential. This model can be realized with ultracold atoms or molecules when their dipole ...