Ara es mostren els items 1-20 de 59

  • 4He adsorbed outside a single carbon nanotube 

    Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (2012-10-08)
    Article
    Accés obert
    The phase diagrams of 4He adsorbed on the external surfaces of single armchair carbon nanotubes with radii in the range 3.42–10.85 Å are calculated using the diffusion Monte Carlo method. For nanotubes narrower than a ...
  • Atomic monolayer deposition on the surface of nanotube mechanical resonators 

    Tavernarakis, Alexandros; Chaste, Julien; Eichler, Alexander; Ceballo, Gustavo; Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi; Bachtold, Adrian (2014-05-14)
    Article
    Accés obert
    We study monolayers of noble gas atoms (Xe, Kr, Ar, and Ne) deposited on individual ultraclean suspended nanotubes. For this, we record the resonance frequency of the mechanical motion of the nanotube, since it provides a ...
  • Composite boson description of a low-density gas of excitons 

    Golomedov, A. E.; Lozovik, Yu. E.; Astrakharchik, Grigori; Boronat Medico, Jordi (2017-10-13)
    Article
    Accés restringit per política de l'editorial
    Ground-state properties of a fermionic Coulomb gas are calculated using the fixed-node diffusion Monte Carlo method. The validity of the composite boson description is tested for different densities. We extract the ...
  • Dipolar Bose Supersolid Stripes 

    Bombín Escudero, Raul; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (2017-12-20)
    Article
    Accés obert
    We study the superfluid properties of a system of fully polarized dipolar bosons moving in the XY plane. We focus on the general case where the polarization field forms an arbitrary angle a with respect to the Z axis, ...
  • Dislocation structure and mobility in hcp rare-gas solids: quantum versus classical 

    Sempere Llagostera, Santiago; Serra Tort, Ana María; Boronat Medico, Jordi; Cazorla Silva, Claudio (Multidisciplinary Digital Publishing Institute (MDPI), 2018-02-01)
    Article
    Accés obert
    We study the structural and mobility properties of edge dislocations in rare-gas crystals with the hexagonal close-packed (hcp) structure by using classical simulation techniques. Our results are discussed in the light of ...
  • Distinguishability, degeneracy, and correlations in three harmonically trapped bosons in one dimension 

    Garcia March, Miguel Angel; Julia Diaz, Bruno; Astrakharchik, Grigori; Boronat Medico, Jordi; Polls, A. (2014-12-01)
    Article
    Accés obert
    We study a system of two bosons of one species and a third atom of a second species in a one-dimensional parabolic trap at zero temperature. We assume contact repulsive inter- and intraspecies interactions. By means of an ...
  • Droplets of trapped quantum dipolar bosons 

    Macia Rey, Adrián; Sánchez Baena, Juan; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (2016-11-10)
    Article
    Accés obert
    Strongly interacting systems of dipolar bosons in three dimensions confined by harmonic traps are analyzed using the exact path integral ground-state Monte Carlo method. By adding a repulsive two-body potential, we find a ...
  • Dynamic structure factor of liquid He 4 across the normal-superfluid transition 

    Ferré Porta, Guillem; Boronat Medico, Jordi (2016-03-08)
    Article
    Accés obert
    We have carried out a microscopic study of the dynamic structure factor of liquid He4 across the normal-superfluid transition temperature using the path integral Monte Carlo method. The ill-posed problem of the inverse ...
  • Dynamic structure function of a cold Fermi gas at unitarity 

    Astrakharchik, Grigori; Boronat Medico, Jordi; Krotscheck, Eckhard; Lichtenegger, Thomas (Institute of Physics (IOP), 2014-08-14)
    Article
    Accés obert
    We present a theoretical study of the dynamic structure function of a resonantly interacting two-component Fermi gas at zero temperature. Our approach is based on dynamic many-body theory able to describe excitations in ...
  • Elastic constants of incommensurate solid 4He from diffusion Monte Carlo simulations 

    Cazorla Silva, Claudio; Lutsyshyn, Yaroslav; Boronat Medico, Jordi (2013-06-28)
    Article
    Accés obert
    We study the elastic properties of incommensurate solid 4He in the limit of zero temperature. Specifically, we calculate the pressure dependence of the five elastic constants (C11, C12, C13, C33, and C44), longitudinal and ...
  • Elusive structure of helium trimers 

    Stipanovic, P.; Vranješ Markic, Leandra; Boronat Medico, Jordi (2016-08-23)
    Article
    Accés obert
    Over the years many He–He interaction potentials have been developed, some very sophisticated, including various corrections beyond the Born–Oppenheimer approximation. Most of them were used to predict properties of helium ...
  • Ferromagnetic transition of a two-component Fermi gas of hard spheres 

    Arias de Saavedra, F.; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi; Polls, A. (2012-03-12)
    Article
    Accés obert
    We use microscopic many-body theory to analyze the problem of itinerant ferromagnetism in a repulsive atomic Fermi gas of hard spheres. Using simple arguments we show that the available theoretical predictions for the onset ...
  • Few trapped quantum dipoles: quantum versus classical structures 

    Sánchez Baena, Juan; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (2018-01-31)
    Article
    Accés obert
    We analyze the ground state of a two-dimensional quantum system of a few strongly confined dipolar bosons. Dipoles arrange in different stable structures that depend on the tilting polarization angle and the anisotropy of ...
  • First-principles modeling of quantum nuclear effects and atomic interactions in solid He-4 at high pressure 

    Cazorla Silva, Claudio; Boronat Medico, Jordi (2015-01-07)
    Article
    Accés obert
    We present a first-principles computational study of solid He-4 at T = 0 K and pressures up to similar to 160 GPa. Our computational strategy consists in using van der Waals density functional theory (DFT-vdW) to describe ...
  • First-principles modeling of three-body interactions in highly compressed solid helium 

    Cazorla Silva, Claudio; Boronat Medico, Jordi (2015-12-31)
    Article
    Accés obert
    We present a set of three-body interaction models based on the Slater-Kirkwood (SK) potential that are suitable for the study of the energy, structural, and elastic properties of solid He4 at high pressure. Our effective ...
  • Fluid and registered phases in the second layer of 3He on graphite 

    Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (American Physical Society, 2018-05-29)
    Article
    Accés obert
    A quantum Monte Carlo approach, considering all the corrugation effects, was used to calculate the complete phase diagram of the second 3He layer adsorbed on graphite. We found that a first-layer triangular solid was in ...
  • Gapped spectrum in pair-superfluid bosons 

    Astrakharchik, Grigori; Zillich, Robert E.; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (2016-12-22)
    Article
    Accés obert
    We study the ground state of a bilayer system of dipolar bosons with dipoles oriented by an external field perpendicularly to the two parallel planes. By decreasing the interlayer distance, for a fixed value of the strength ...
  • Ground state of small mixed helium and spin-polarized tritium clusters: A quantum Monte Carlo study 

    Stipanovic, P.; Markic, L. Vranjes; Boronat Medico, Jordi; Kezic, B. (2011-02-07)
    Article
    Accés restringit per política de l'editorial
    We report results for the ground-state energy and structural properties of small 4He–T↓ clusters consisting of up to four T↓ and eight 4He atoms. These results have been obtained using very well-known 4He–4He and T↓– T↓ ...
  • Ground-state properties of weakly bound helium-alkali trimers 

    Stipanovic, P.; Vranješ Markic, Leandra; Zaric, D.; Boronat Medico, Jordi (2017-01-07)
    Article
    Accés obert
    Weakly bound triatomic molecules consisting of two helium atoms and one alkali metal atom are studied by means of the diffusion Monte Carlo method. We determined the stability of 4He2A, 4He3HeA, and 3He2A, where A is one ...
  • H-2 physisorbed on graphane 

    Carbonell Coronado, Carmen; De Soto Borrera, Feliciano Carlos; Cazorla Silva, Claudio; Boronat Medico, Jordi; Gordillo Bargueño, Maria Carmen (2013-06)
    Article
    Accés obert
    We study the zero-temperature phase diagrams of H2 adsorbed on the three structures predicted for graphane (chair, boat and washboard graphane), using a diffusion Monte Carlo technique. Graphane is the hydrogenated version ...