Exploració per autor "Mazzanti Castrillejo, Fernando Pablo"
Ara es mostren els items 18-37 de 38
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Off-diagonal long-range order in arrays of dipolar droplets
(Institute of Physics (IOP), 2024-01-01)
Article
Accés obertWe 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 ... -
One-dimensional Bose gas in optical lattices of arbitrary strength
(2016-02-08)
Article
Accés obertOne-dimensional Bose gas with contact interaction in optical lattices at zero temperature is investigated by means of the exact diffusion Monte Carlo algorithm. The results obtained from the fundamental continuous model ... -
One-dimensional harmonically confined SU(N) fermions
(American Physical Society (APS), 2019-08-05)
Article
Accés obertWe study the momentum distributions and spatial correlations of few harmonically confined SU(N) fermions using quantum Monte Carlo methods. In our study, we vary the spin degeneracy N from 2 to 6 and the total number of ... -
Optical lattices as a tool to study defect-induced superfluidity
(AMER PHYSICAL SOC, 2017-09-05)
Article
Accés obertWe study the superfluid response, the energetic and structural properties of a one-dimensional ultracold Bose gas in an optical lattice of arbitrary strength. We use the Bose-Fermi mapping in the limit of infinitely large ... -
Phase diagram of dipolar bosons in two dimensions with tilted polarization
(2014-12-01)
Article
Accés obertWe analyze the ground state of a system of dipolar bosons moving in the XY plane and such that their dipolar moments are all aligned in a fixed direction in space. We focus on the general case where the polarization field ... -
Pràctiques de Laboratori
(Universitat Politècnica de Catalunya, 2015)
Pràctica
Accés obert -
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 ... -
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. ... -
Self-bound Bose mixtures
(American Physical Society (APS), 2018-08-31)
Article
Accés obertRecent experiments confirmed that fluctuations beyond the mean-field approximation can lead to self-bound liquid droplets of ultradilute binary Bose mixtures. We proceed beyond the beyond-mean-field approximation and study ... -
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 ... -
Stopping criteria in contrastive divergence: Alternatives to the reconstruction error
(2014)
Text en actes de congrés
Accés obertRestricted Boltzmann Machines (RBMs) are general unsupervised learning devices to ascertain generative models of data distributions. RBMs are often trained using the Contrastive Divergence learning algorithm (CD), an ... -
Striped dilute liquid of dipolar bosons in two dimensions
(American Physical Society, 2023-09-01)
Article
Accés restringit per política de l'editorialWe investigate the phases of a Bose-Einstein condensate of dipolar atoms restricted to move in a two-dimensional plane. The dipole moments are all aligned in a direction tilted with respect to the plane normal. As a result ... -
Supersolid striped droplets in a Raman spin-orbit-coupled system
(American Physical Society, 2020-11-09)
Article
Accés obertWe analyze the role played by quantum fluctuations on a Raman spin-orbit-coupled system in the stripe phase under attractive interspin interactions. We show that beyond-mean-field effects stabilize the collapse predicted ... -
Supersolid stripes enhanced by correlations in a Raman spin-orbit-coupled system
(American Physical Society (APS), 2020-04-01)
Article
Accés obertA Bose gas under the effect of Raman spin-orbit coupling (SOC) is analyzed using the discrete spin T-moves diffusion Monte Carlo method. Upon computing the energy as well as the static structure factor and the superfluid ... -
The effective two-particle interaction of cold atoms as derived from bragg scattering
(2012-12)
Article
Accés obertWe study the dynamic structure function of ultracold alkali-metal gases for large scattering lengths and momenta where corrections to the mean field approximation become important. We compare our result with the Bragg-scattering ... -
Time-dependent variational Monte Carlo study of the dynamic response of bosons in an optical lattice
(2022-08-18)
Article
Accés obertWe study the dynamics of a one-dimensional Bose gas at unit filling in both shallow and deep optical lattices and obtain the dynamic structure factor S(k,¿) by monitoring the linear response to a weak probe pulse. We ... -
Two-dimensional mixture of dipolar fermions: Equation of state and magnetic phases
(American Physical Society (APS), 2019-04-08)
Article
Accés obertWe study a two-component mixture of fermionic dipoles in two dimensions at zero temperature, interacting via a purely repulsive 1/r3 potential. This model can be realized with ultracold atoms or molecules when their dipole ... -
Two-dimensional repulsive Fermi polarons with short- A nd long-range interactions
(American Physical Society (APS), 2019-08-09)
Article
Accés obertWe study the repulsive polaron problem in a two-component two-dimensional system of fermionic atoms. We use two different interaction models: a short-range (hard-disk) potential and a dipolar potential. In our approach, ... -
Universal properties of anisotropic dipolar bosons in two dimensions
(2022-08-25)
Article
Accés obertThe energy of ultra-dilute quantum many-body systems is known to exhibit a universal dependence on the gas parameter x = n a d 0 , with n the density, d the dimensionality of the space ( d = 1 , 2 , 3 ) and a 0 the s -wave ... -
Weighted contrastive divergence
(2019-06)
Article
Accés obertLearning algorithms for energy based Boltzmann architectures that rely on gradient descent are in general computationally prohibitive, typically due to the exponential number of terms involved in computing the partition ...
