Exploració per autor "Boronat Medico, Jordi"
Ara es mostren els items 65-84 de 106
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Quantum correlations and spatial localization in one-dimensional ultracold bosonic mixtures
(2014-10-07)
Article
Accés obertWe 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, ... -
Quantum halo states in helium tetramers
(2017-01-12)
Article
Accés obertThe universality of quantum halo states enables a comparison of systems from different fields of physics, as demonstrated in two- and three-body clusters. In the present work, we studied weakly bound helium tetramers in ... -
Quantum halo states in two-dimensional dipolar clusters
(Nature, 2021-12-01)
Article
Accés obertA halo is an intrinsically quantum object defined as a bound state of a spatial size which extends deeply into the classically forbidden region. Previously, halos have been observed in bound states of two and less frequently ... -
Quantum Monte Carlo estimation of complex-time correlations for the study of the ground-state dynamic structure function
(2015-03-21)
Article
Accés obertWe present a method based on the path integral Monte Carlo formalism for the calculation of ground-state time correlation functions in quantum systems. The key point of the method is the consideration of time as a complex ... -
Quantum Monte Carlo simulation of spin-polarized tritium
(2009)
Article
Accés obertThe ground-state properties of spin-polarized tritium T↓ at zero temperature are obtained by means of diffusion Monte Carlo calculations. Using an accurate ab initio T↓-T↓ interatomic potential we have studied its liquid ... -
Quantum Monte Carlo study of large spin-polarized tritium clusters
(2009)
Article
Accés obertThis work expands recent investigations in the field of spin-polarized tritium T↓ clusters. We report the results for the ground-state energy and structural properties of large T↓ clusters consisting of up to 320 atoms. ... -
Quantum phase transition with a simple variational ansatz
(2014-12-11)
Article
Accés obertWe study the zero-temperature quantum phase transition between liquid and hcp solid He-4. We use the variational method with a simple yet exchange-symmetric and fully explicit wave function. It is found that the optimized ... -
Quantum-Monte-Carlo-based functional for dysprosium dipolar systems
(American Physical Society, 2024-03-19)
Article
Accés obertWe present a quantum-Monte-Carlo–based density functional to describe droplet formation and supersolidity in dipolar systems. The usual Lee-Huang-Yang term, accounting for quantum correlations in the conventional extended ... -
Quasiparticle nature of the Bose polaron at finite temperature
(American Institute of Physics (AIP), 2021-11-10)
Article
Accés obertThe Bose polaron has attracted theoretical and experimental interest because the mobile impurity is surrounded by a bath that undergoes a superfluid-to-normal phase transition. Although many theoretical works have studied ... -
Reply to "comment on 'Berezinskii-Kosterlitz-Thouless transition in two-dimensional dipolar stripes' "
(American Physical Society, 2020-10-19)
Article
Accés obertThis is a Reply to the Comment from F. Cinti and M. Boninsegni on our recent work on the Berezinskii-Kosterlitz-Thouless (BKT) phase transition in a two-dimensional dipolar system [Bombín, Mazzanti, and Boronat, Phys. Rev. ... -
Second layer of H2 and D2 adsorbed on graphene
(2013-04-03)
Article
Accés obertWe report diffusion Monte Carlo calculations on the phase diagrams of para-H2 and ortho-D2 adsorbed on top of a first layer of the same substances on graphene. We found that the ground state of the second layer is a ... -
Sharp crossover from composite fermionization to phase separation in microscopic mixtures of ultracold bosons
(2013-12-03)
Article
Accés obertWe show that a two-component mixture of a few repulsively interacting ultracold atoms in a one-dimensional trap possesses very diverse quantum regimes and that the crossover between them can be induced by tuning the ... -
Simulation and understanding of atomic and molecular quantum crystals
(2017-08-03)
Article
Accés obertQuantum crystals abound in the whole range of solid-state species. Below a certain threshold temperature the physical behavior of rare gases (4He and Ne), molecular solids (H2 and CH4), and some ionic (LiH), covalent ... -
Single-particle versus pair superfluidity in a bilayer system of dipolar bosons
(2014-10-21)
Article
Accés obertWe consider the ground state of a bilayer system of dipolar bosons, where dipoles are oriented by an external field in the direction perpendicular to the parallel planes. Quantum Monte Carlo methods are used to calculate ... -
Solidification of small p-H(2) clusters at zero temperature
(2011-06-30)
Article
Accés restringit per política de l'editorialWe have determined the ground-state energies of para-H2 clusters at zero temperature using the diffusion Monte Carlo method. The liquid or solid character of each cluster is investigated by restricting the phase through ... -
Spin-polarized hydrogen adsorbed on the surface of superfluid He-4
(2013-12-14)
Article
Accés obertThe experimental realization of a thin layer of spin-polarized hydrogen H double down arrow adsorbed on top of the surface of superfluid He-4 provides one of the best examples of a stable, nearly two-dimensional(2D) quantum ... -
Squeezing Bose-Bose liquid drops
(American Physical Society, 2024-01-16)
Article
Accés restringit per política de l'editorialWe explore ultradilute Bose-Bose liquid droplets squeezed by an external harmonic potential in one spatial direction. Our theoretical study is based on a functional that is built using quantum Monte Carlo results of the ... -
Structural superfluid-Mott-insulator transition for a Bose gas in multirods
(American Physical Society, 2021-01-14)
Article
Accés obertWe report on a structural superfluid–Mott-insulator (SF-MI) quantum phase transition for an interacting one-dimensional Bose gas within permeable multirod lattices, where the rod lengths are varied from zero to the lattice ... -
Structure of halo and quasi-halo helium–helium–alkali trimers
(2017-05-01)
Article
Accés obertWe report a diffusion Monte Carlo study of A4He2 and A4He3He trimers’ structural properties, were A is one of the alkali atoms 6,7Li, 23Na, 39K, 85Rb or 133Cs. Some of them are in a pure halo state, characterized by large ... -
Superfluid and supersolid phases of He-4 on the second layer of graphite
(American Institute of Physics (AIP), 2020-05-22)
Article
Accés obertWe revisited the phase diagram of the second layer of 4He on top of graphite using quantum Monte Carlo methods. Our aim was to explore the existence of the novel phases suggested recently in experimental works, and determine ...
