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Ara es mostren els items 46-65 de 106

    • Microscopic description of anisotropic low-density dipolar Bose gases in two dimensions 

      Macia Rey, Adrián; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi; Zillich, R.E. (2011-09-19)
      Article
      Accés obert
      A microscopic description of the zero-energy two-body ground state and many-body static properties of anisotropic homogeneous gases of bosonic dipoles in two dimensions at low densities is presented and discussed. By ...

    • Mixtures of dipolar gases in two dimensions: a quantum Monte Carlo study 

      Pradas Rodriguez, Sergi; Boronat Medico, Jordi (2022-06-01)
      Article
      Accés obert
      We studied the miscibility of two dipolar quantum gases in the limit of zero tempera-ture. The system under study is composed of a mixture of two Bose gases with dominant dipolarinteraction in a two-dimensional harmonic ...

    • Observation of dynamic atom-atom correlation in liquid helium in real space 

      Dmowski, W.; Diallo, S. O.; Lokshin, K.; Ehlers, G.; Ferré Porta, Guillem; Boronat Medico, Jordi; Egami, T. (2017-05-04)
      Article
      Accés obert
      Liquid He-4 becomes superfluid and flows without resistance below temperature 2.17 K. Superfluidity has been a subject of intense studies and notable advances were made in elucidating the phenomenon by experiment and theory. ...

    • Observation of dynamic atom-atom correlation in liquid helium in real space 

      Dmowski, Wojtek; Diallo, Souleymane Omar; Lokshin, Konstantin A.; Ehlers, Georg; Ferré Porta, Guillem; Boronat Medico, Jordi; Egami, Takeshi (2017-05-04)
      Article
      Accés obert
      © The Author(s) 2017. Liquid 4He becomes superfluid and flows without resistance below temperature 2.17 K. Superfluidity has been a subject of intense studies and notable advances were made in elucidating the phenomenon ...

    • Off-diagonal long-range order in arrays of dipolar droplets 

      Bombín Escudero, Raul; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (Institute of Physics (IOP), 2024-01-01)
      Article
      Accés obert
      We report quantum Monte Carlo results of harmonically confined quantum Bose dipoles within a range of interactions covering the evolution from a gas phase to the formation of an array of droplets. Scaling the experimental ...

    • 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 ...

    • One-dimensional harmonically confined SU(N) fermions 

      Gordillo Bargueño, Maria Carmen; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (American Physical Society (APS), 2019-08-05)
      Article
      Accés obert
      We study the momentum distributions and spatial correlations of few harmonically confined SU(N) fermions using quantum Monte Carlo methods. In our study, we vary the spin degeneracy N from 2 to 6 and the total number of ...

    • One-dimensional three-boson problem with two- and three-body interactions 

      Guijarro Gámez, Grecia; Pricoupenko, A.; Astrakharchik, Grigori; Boronat Medico, Jordi; Petrov, D. S. (American Physical Society (APS), 2018-06-14)
      Article
      Accés obert
      We solve the three-boson problem with contact two- and three-body interactions in one dimension and analytically calculate the ground and excited trimer-state energies. Then, by using the diffusion Monte Carlo technique, ...

    • Optical lattices as a tool to study defect-induced superfluidity 

      Astrakharchik, Grigori; Krutitsky, K.V.; Lewenstein, Maciej; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (AMER PHYSICAL SOC, 2017-09-05)
      Article
      Accés obert
      We study the superfluid response, the energetic and structural properties of a one-dimensional ultracold Bose gas in an optical lattice of arbitrary strength. We use the Bose-Fermi mapping in the limit of infinitely large ...

    • 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 ...

    • Phase diagram of a quantum Coulomb wire 

      Ferré Porta, Guillem; Astrakharchik, Grigori; Boronat Medico, Jordi (2015-12-09)
      Article
      Accés obert

    • Phase diagram of dipolar bosons in two dimensions with tilted polarization 

      Macia Rey, Adrián; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (2014-12-01)
      Article
      Accés obert
      We analyze the ground state of a system of dipolar bosons moving in the XY plane and such that their dipolar moments are all aligned in a fixed direction in space. We focus on the general case where the polarization field ...

    • Phase diagram of H-2 adsorbed on graphene 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (2010-04-15)
      Article
      Accés obert
      The phase diagram of the first layer of H2 adsorbed on top of a single graphene sheet has been calculated by means of a series of diffusion Monte Carlo simulations. We have found that, as in the case of 4He, the ground ...

    • Phase diagrams of He-4 on flat and curved environments 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (2013-06)
      Article
      Accés obert
      By means of diffusion Monte Carlo calculations, we obtained the phase diagrams of a first and second layer of 4He on graphene and on the outside of different isolated armchair carbon nanotubes with radii in the range 3.42 ...

    • Phase separation in binary Bose mixtures at finite temperature 

      Spada, Gabriele; Parisi, L.; Pascual López, Gerard; Parker, Nicholas G.; Billam, Thomas P.; Pilati, Sebastiano; Boronat Medico, Jordi; Giorgini, Stefano (2023-10-18)
      Article
      Accés obert
      We investigate the magnetic behavior of finite-temperature repulsive two-component Bose mixtures by means of exact path-integral Monte-Carlo simulations. Novel algorithms are implemented for the free energy and the chemical ...

    • Phases of 4He and H2 adsorbed on a single carbon nanotube 

      Gordillo Bargueño, Maria Carmen; Rodríguez García, R.; Boronat Medico, Jordi (American Physical Society (APS), 2023-05-22)
      Article
      Accés restringit per política de l'editorial
      Using a diffusion Monte Carlo technique, we calculated the phase diagrams of 4He and H2 adsorbed on a single (5,5) carbon nanotube, one of the narrowest that can be obtained experimentally. For a single monolayer, when the ...

    • Phases of He 4 and H2 adsorbed on doped graphene 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (American Physical Society (APS), 2023-10-01)
      Article
      Accés restringit per política de l'editorial
      The influence of attractive boron impurities, embedded on a graphene sheet, on the phase diagrams of 4He and H2 adsorbed on top was studied using the diffusion Monte Carlo method. The doping of graphene was made by ...

    • Possible superfluidity of molecular hydrogen in a two-dimensional crystal phase of sodium 

      Cazorla Silva, Claudio; Boronat Medico, Jordi (2013-12-03)
      Article
      Accés obert
      We theoretically investigate the ground-state properties of a molecular para-hydrogen (p-H 2 ) film in which crystallization is energetically frustrated by embedding sodium (Na) atoms periodically distributed in a triangular ...

    • Pràctiques de Laboratori 

      Canales Gabriel, Manel; Trullàs Simó, Joaquim; Ametller Congost, Lluís; Llanta Salleras, Estanislao; Rey Oriol, Rosendo; Casulleras Ambrós, Joaquín; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi; Martí Rabassa, Jordi; Guàrdia Manuel, Elvira; Sesé Castel, Gemma; Pastor Satorras, Romualdo (Universitat Politècnica de Catalunya, 2015)
      Pràctica
      Accés obert

    • Quantum correlations and spatial localization in one-dimensional ultracold bosonic mixtures 

      Garcia March, Miguel Angel; Julia Diaz, Bruno; Astrakharchik, Grigori; Busch, Th; Boronat Medico, Jordi; Polls, A. (2014-10-07)
      Article
      Accés obert
      We present the complete phase diagram for one-dimensional binary mixtures of bosonic ultracold atomic gases in a harmonic trap. We obtain exact results with direct numerical diagonalization for a small number of atoms, ...