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Now showing items 1-20 of 89

    • 4He adsorbed outside a single carbon nanotube 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (2012-10-08)
      Article
      Open Access
      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
      Open Access
      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 ...

    • Berezinskii-Kosterlitz-Thouless transition in two-dimensional dipolar stripes 

      Bombín Escudero, Raul; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (American Physical Society (APS), 2019-12-05)
      Article
      Open Access
      A two-dimensional quantum system of dipoles, with a polarization angle not perpendicular to the plane, shows a transition from a gas to a stripe phase. We have studied the thermal properties of these two phases using the ...

    • 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
      Open Access
      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 ...

    • Dark-soliton-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas [Dataset] 

      Rosi, Giulia de; Rota, Riccardo; Astrakharchik, Grigori; Boronat Medico, Jordi (Universitat Politècnica de Catalunya, 2021-10-05)
      Dataset
      Open Access

    • Diffusion Monte Carlo methods for spin-orbit-coupled ultracold Bose gases 

      Sánchez Baena, Juan; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (American Physical Society (APS), 2018-11-27)
      Article
      Open Access
      We present two diffusion Monte Carlo (DMC) algorithms for systems of ultracold quantum gases featuring synthetic spin-orbit interactions. The first one is a spin-integrated DMC method which provides fixed-phase energy ...

    • Dilute dipolar quantum droplets beyond the extended Gross-Pitaevskii equation 

      Bötcher, Fabian; Wenzel, Matthias; Schmidt, Jan-Niklas; Guo, Mingyang; Langen, Tim; Ferrier-Barbut, Igor; Pfau, Tilman; Bombín Escudero, Raul; Sánchez Baena, Juan; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (American Physical Society, 2019-11-08)
      Article
      Open Access
      Dipolar quantum droplets are exotic quantum objects that are self-bound due to the subtle balance of attraction, repulsion, and quantum correlations. Here we present a systematic study of the critical atom number of these ...

    • Dilute quantum liquid in a K-Rb Bose mixture 

      Cikojevic, Viktor; Poli, E.; Ancilotto, F.; Vranješ Markic, Leandra; Boronat Medico, Jordi (American Physical Society (APS), 2021-09-24)
      Article
      Open Access
      A quantum liquid in a heterogeneous mixture of 41K and 87Rb atoms is studied using the diffusion Monte Carlo method and density-functional theory. The perturbative Lee-Huang-Yang term for a heterogeneous mixture is verified ...

    • Dipolar Bose Supersolid Stripes 

      Bombín Escudero, Raul; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (2017-12-20)
      Article
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Open Access
      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 ...

    • Dynamics of equilibration and collisions in ultradilute quantum droplets 

      Cikojevic, Viktor; Vranješ Markic, Leandra; Barranco Gómez, Manuel; Ancilotto, F.; Boronat Medico, Jordi (American Physical Society, 2021-12-01)
      Article
      Open Access
      Employing time-dependent density-functional theory, we have studied dynamical equilibration and binary head-on collisions of quantum droplets taking as a case of study droplets made of a 39K-39K Bose mixture. The phase ...

    • Elastic constants of incommensurate solid 4He from diffusion Monte Carlo simulations 

      Cazorla Silva, Claudio; Lutsyshyn, Yaroslav; Boronat Medico, Jordi (2013-06-28)
      Article
      Open Access
      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
      Open Access
      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 ...

    • 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
      Open Access
      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 ...

    • 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
      Open Access
      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
      Open Access
      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 ...