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Ara es mostren els items 31-50 de 105

    • 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 ...

    • Liquid and solid phases of He-3 on graphite 

      Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (2016-04-04)
      Article
      Accés obert
      Recent heat-capacity experiments show quite unambiguously the existence of a liquid He-3 phase adsorbed on graphite. This liquid is stable at an extremely low density, possibly one of the lowest found in nature. Previous ...

    • Low-dimensional weakly interacting Bose gases: nonuniversal equations of state 

      Astrakharchik, Grigori; Boronat Medico, Jordi; Kurbakov, I L; Lozovik, Y E; Mazzanti Castrillejo, Fernando Pablo (2010-01)
      Article
      Accés obert
      The zero-temperature equation of state is analyzed in low-dimensional bosonic systems. We propose to use the concept of energy-dependent s-wave scattering length for obtaining estimations of nonuniversal terms in the energy ...

    • Low-energy scattering parameters: A theoretical derivation of the effective range and scattering length for arbitrary angular momentum 

      Pera i Ferreruela, Jordi; Boronat Medico, Jordi (AMER INST PHYSICS, 2023-02-01)
      Article
      Accés obert
      The most important parameters in the study of low-energy scattering are the s-wave and p-wave scattering lengths and the s-wave effective range. We solve the scattering problem and find two useful formulas for the scattering ...

    • Luttinger parameter of quasi-one-dimensional para- H2 

      Ferré Porta, Guillem; Gordillo Bargueño, Maria Carmen; Boronat Medico, Jordi (2017-02-06)
      Article
      Accés obert
      We have studied the ground-state properties of para-hydrogen in one dimension and in quasi-one-dimensional configurations using the path-integral ground-state Monte Carlo method. This method produces zero-temperature exact ...

    • Luttinger-liquid behavior of one-dimensional He-3 

      Astrakharchik, Grigori; Boronat Medico, Jordi (2014-12-30)
      Article
      Accés obert
      The ground-state properties of one-dimensional He-3 are studied using quantum Monte Carlo methods. The equation of state is calculated in a wide range of physically relevant densities and is well interpolated by a power-series ...

    • 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 ...