Ara es mostren els items 21-40 de 104

    • Estimation of the condensate fraction from the static structure factor 

      Lozovik, Yu. E.; Kurbakov, I. L.; Astrakharchik, Grigori; Boronat Medico, Jordi (American Physical Society (APS), 2021-03-16)
      Article
      Accés obert
      We present an analytical method to estimate the condensate fraction n0/n in strongly correlated systems for which the zero-temperature static structure factor S(p) is known. The advantage of the proposed method is that it ...
    • Excitonic insulator to superconductor phase transition in ultra-compressed helium 

      Liu, Cong; Errea Lope, Ion; Ding, Chi; Pickard, Chris J.; Conway, Lewis J.; Monserrat Sánchez, Bartomeu; Fang, Yue Wen; Lu, Qing; Sun, Jian; Boronat Medico, Jordi; Cazorla Silva, Claudio (2023-07-25)
      Article
      Accés obert
      Helium, the second most abundant element in the universe, exhibits an extremely large electronic band gap of about 20 eV at ambient pressures. While the metallization pressure of helium has been accurately determined, thus ...
    • 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 ...
    • Few-body bound states of two-dimensional bosons 

      Guijarro Gámez, Grecia; Astrakharchik, Grigori; Boronat Medico, Jordi; Bazak, Betzalel; Petrov, D. S. (American Physical Society (APS), 2020-04-07)
      Article
      Accés obert
      We study clusters of the type $A_NB_M$ with N=M=3 in a two-dimensional mixture of A and B bosons, with attractive AB and equally repulsive AA and BB interactions. In order to check universal aspects of the problem, we ...
    • Finite-range effects in the two-dimensional repulsive Fermi polaron 

      Bombín Escudero, Raul; Cikojevic, Viktor; Sánchez Baena, Juan; Boronat Medico, Jordi (American Physical Society, 2021-04-01)
      Article
      Accés obert
      We study the repulsive Fermi polaron in a two-component, two-dimensional system of fermionic atoms inspired by the results of a recent experiment with 173Yb atoms [N. Darkwah Oppong et al., Phys. Rev. Lett. 122, 193604 ...
    • Finite-range effects in ultradilute quantum drops 

      Cikojevic, Viktor; Vranješ Markic, Leandra; Boronat Medico, Jordi (2020-05-27)
      Article
      Accés obert
      In the first experimental realization of dilute Bose–Bose liquid drops using two hyperfine states of 39K some discrepancies between theory and experiment were observed. The standard analysis of the data using the Lee–Huang–Yang ...
    • 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 ...
    • H2 superglass on an amorphous carbon substrate 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (American Physical Society (APS), 2023-02-01)
      Article
      Accés restringit per política de l'editorial
      The phase diagram of a para-H2 monolayer absorbed on an experimentally synthesized amorphous carbon sheet was calculated using a diffusion Monte Carlo technique. We found that the ground state of that system changed ...
    • He-3 on preplated graphite 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (American Physical Society, 2016-10-18)
      Article
      Accés obert
      By using the diffusion Monte Carlo method, we obtained the full phase diagram of He3 on top of graphite preplated with a solid layer of He4. All the He4 atoms of the substrate were explicitly considered and allowed to move ...
    • 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 ...
    • Itinerant ferromagnetism in dilute SU(N) Fermi gases 

      Pera i Ferreruela, Jordi; Casulleras Ambrós, Joaquín; Boronat Medico, Jordi (2023-03-17)
      Article
      Accés obert
      We present exact analytic results for the energy of a SU(N) repulsive Fermi gas as a function of the spin-channel occupation at second order in the gas parameter. This is an extension of previous results that now incorporates ...
    • Layering transition in superfluid helium adsorbed on a carbon nanotube mechanical resonator 

      Noury, Adrien; Vergara Cruz, Jorge; Morfin, Pascal; Plaçais, Bernard; Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi; Balibar, Sébastien; Bachtold, Adrian (American Institute of Physics (AIP), 2019-04-23)
      Article
      Accés obert
      Helium is recognized as a model system for the study of phase transitions. Of particular interest is the superfluid phase in two dimensions. We report measurements on superfluid helium films adsorbed on the surface of a ...