Browsing by Author "Mazzanti Castrillejo, Fernando Pablo"

Diffusion Monte Carlo methods for spinorbitcoupled ultracold Bose gases
Sánchez Baena, Juan; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (American Physical Society (APS), 20181127)
Article
Open AccessWe present two diffusion Monte Carlo (DMC) algorithms for systems of ultracold quantum gases featuring synthetic spinorbit interactions. The first one is a spinintegrated DMC method which provides fixedphase energy ... 
Dipolar Bose Supersolid Stripes
Bombín Escudero, Raul; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (20171220)
Article
Open AccessWe 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, ... 
Droplets of trapped quantum dipolar bosons
Macia Rey, Adrián; Sánchez Baena, Juan; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (20161110)
Article
Open AccessStrongly interacting systems of dipolar bosons in three dimensions confined by harmonic traps are analyzed using the exact path integral groundstate Monte Carlo method. By adding a repulsive twobody potential, we find a ... 
Ferromagnetic transition of a twocomponent Fermi gas of hard spheres
Arias de Saavedra, F.; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi; Polls, A. (20120312)
Article
Open AccessWe use microscopic manybody 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 (20180131)
Article
Open AccessWe analyze the ground state of a twodimensional 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 ... 
Gapped spectrum in pairsuperfluid bosons
Astrakharchik, Grigori; Zillich, Robert E.; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (20161222)
Article
Open AccessWe 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 ... 
Highorder time expansion path integral ground state
Rota, Riccardo; Casulleras Ambrós, Joaquín; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (201001)
Article
Open AccessThe feasibility of path integral Monte Carlo ground state calculations with very few beads using a highorder shorttime Green’s function expansion is discussed. An explicit expression of the evolution operator which provides ... 
Lowdimensional weakly interacting Bose gases: nonuniversal equations of state
Astrakharchik, Grigori; Boronat Medico, Jordi; Kurbakov, I L; Lozovik, Y E; Mazzanti Castrillejo, Fernando Pablo (201001)
Article
Open AccessThe zerotemperature equation of state is analyzed in lowdimensional bosonic systems. We propose to use the concept of energydependent swave scattering length for obtaining estimations of nonuniversal terms in the energy ... 
Microscopic description of anisotropic lowdensity dipolar Bose gases in two dimensions
Macia Rey, Adrián; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi; Zillich, R.E. (20110919)
Article
Open AccessA microscopic description of the zeroenergy twobody ground state and manybody static properties of anisotropic homogeneous gases of bosonic dipoles in two dimensions at low densities is presented and discussed. By ... 
Neighborhoodbased stopping criterion for contrastive divergence
Romero Merino, Enrique; Mazzanti Castrillejo, Fernando Pablo; Delgado Pin, Jordi (201807)
Article
Open AccessRestricted Boltzmann Machines (RBMs) are general unsupervised learning devices to ascertain generative models of data distributions. RBMs are often trained using the Contrastive Divergence (CD) learning algorithm, an ... 
Onedimensional Bose gas in optical lattices of arbitrary strength
Astrakharchik, Grigori; Krutitsky, K.V.; Lewenstein, Maciej; Mazzanti Castrillejo, Fernando Pablo (20160208)
Article
Open AccessOnedimensional 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 ... 
Optical lattices as a tool to study defectinduced superfluidity
Astrakharchik, Grigori; Krutitsky, K.V.; Lewenstein, Maciej; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (AMER PHYSICAL SOC, 20170905)
Article
Open AccessWe study the superfluid response, the energetic and structural properties of a onedimensional ultracold Bose gas in an optical lattice of arbitrary strength. We use the BoseFermi mapping in the limit of infinitely large ... 
Phase diagram of dipolar bosons in two dimensions with tilted polarization
Macia Rey, Adrián; Boronat Medico, Jordi; Mazzanti Castrillejo, Fernando Pablo (20141201)
Article
Open AccessWe 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 ... 
Quantum Monte Carlo estimation of complextime correlations for the study of the groundstate dynamic structure function
Rota, R; Casulleras Ambrós, Joaquín; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (20150321)
Article
Open AccessWe present a method based on the path integral Monte Carlo formalism for the calculation of groundstate time correlation functions in quantum systems. The key point of the method is the consideration of time as a complex ... 
Selfbound Bose mixtures
Staudinger, Clemens; Mazzanti Castrillejo, Fernando Pablo; Zillich, Robert E. (American Physical Society (APS), 20180831)
Article
Open AccessRecent experiments confirmed that fluctuations beyond the meanfield approximation can lead to selfbound liquid droplets of ultradilute binary Bose mixtures. We proceed beyond the beyondmeanfield approximation and study ... 
Singleparticle versus pair superfluidity in a bilayer system of dipolar bosons
Macia Rey, Adrián; Astrakharchik, Grigori; Mazzanti Castrillejo, Fernando Pablo; Giorgini, Stefano; Boronat Medico, Jordi (20141021)
Article
Open AccessWe 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
Buchaca, David; Romero Merino, Enrique; Mazzanti Castrillejo, Fernando Pablo; Delgado Pin, Jordi (2014)
Conference report
Open AccessRestricted 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 ... 
The effective twoparticle interaction of cold atoms as derived from bragg scattering
Sarjonen, R.; Saarela, M.; Mazzanti Castrillejo, Fernando Pablo (201212)
Article
Open AccessWe study the dynamic structure function of ultracold alkalimetal gases for large scattering lengths and momenta where corrections to the mean field approximation become important. We compare our result with the Braggscattering ... 
Twodimensional mixture of dipolar fermions: Equation of state and magnetic phases
Comparin, Tommaso; Bombín Escudero, Raul; Holzmann, Markus; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi; Giorgini, Stefano (American Physical Society (APS), 20190408)
Article
Open AccessWe study a twocomponent 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 ... 
Weighted contrastive divergence
Romero Merino, Enrique; Mazzanti Castrillejo, Fernando Pablo; Delgado Pin, Jordi; Buchaca Prats, David (201906)
Article
Restricted access  publisher's policyLearning 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 ...