Exploració per tema "Bose-Einstein condensation"
Ara es mostren els items 1-20 de 49
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Bose polarons in ultracold atoms in one dimension: beyond the Fröhlich paradigm
(2017-10-25)
Article
Accés obertMobile impurity atoms immersed in Bose–Einstein condensates provide a new platform for exploring Bose polarons. Recent experimental advances in the field of ultracold atoms make it possible to realize such systems with ... -
Bose-Einstein condensate comagnetometer
(American Institute of Physics (AIP), 2020-04-29)
Article
Accés obertWe describe a comagnetometer employing the f ¼ 1 and f ¼ 2 ground state hyperfine manifolds of a 87Rb spinor Bose-Einstein condensate as colocated magnetometers. The hyperfine manifolds feature nearly opposite gyromagnetic ... -
Bose-Einstein condensates with localized spin-orbit coupling: Soliton complexes and spinor dynamics
(2014-12-15)
Article
Accés obertSpin-orbit (SO) coupling can be introduced in a Bose-Einstein condensate (BEC) as a gauge potential acting only in a localized spatial domain. The effect of such a SO “defect” can be understood by transforming the system to ... -
Bose-Hubbard model of a Bose-Einstein condensate in a double-well
(Universitat Politècnica de Catalunya, 2010-07-19)
Projecte Final de Màster Oficial
Accés obertWe study the static and dynamic behavior of a Bose-Einstein condensate in a double-well potential in the framework of the Bose-Hubbard model. Particular attention is devoted to analyze the structure of the ground state ... -
Collective excitations of a one-dimensional quantum droplet
(2020-05-21)
Article
Accés obertWe calculate the excitation spectrum of a one-dimensional self-bound quantum droplet in a two-component bosonic mixture described by the Gross-Pitaevskii equation (GPE) with cubic and quadratic nonlinearities. The cubic ... -
Compactons and bistability in exciton-polariton condensates
(2012-11-15)
Article
Accés obertWe address stationary patterns in exciton-polariton condensates supported by a narrow external pump beam, and we discover that even in the absence of trapping potentials, such condensates may support stable localized stationary ... -
Composite boson description of a low-density gas of excitons
(2017-10-13)
Article
Accés obertGround-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 ... -
Correlation properties of a one-dimensional repulsive Bose gas at finite temperature
(2023-04-05)
Article
Accés obertWe present a comprehensive study shedding light on how thermal fluctuations affect correlations in a Bose gas with contact repulsive interactions in one spatial dimension. The pair correlation function, the static structure ... -
Density functional approach in the study of Bose-Bose liquid drops
(Universitat Politècnica de Catalunya, 2022-10-28)
Projecte Final de Màster Oficial
Accés obertWe have studied quantum liquid drops composed by a mixture of two Bose components using a density-functional formulation. The functional has been built following two different methods: the beyond mean-field Lee-Huang-Yang ... -
Dilute quantum Bose gases beyond its limit of universality
(Universitat Politècnica de Catalunya, 2023-07-10)
Treball Final de Grau
Accés obertThe Bose equation of state has not progressed significantly since the universality regime discovery in terms of the s-wave scattering length, a. Nowadays no expansion exists to calculate the energy at higher densities, ... -
Dipolar Bose Supersolid Stripes
(2017-12-20)
Article
Accés obertWe 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, ... -
Dynamics of a Bose Einstein condensate in a ring potential
(Universitat Politècnica de Catalunya / Universitat Autònoma de Barcelona, 2012-09-04)
Projecte Final de Màster Oficial
Accés obert[ANGLÈS] We have addressed the dynamics of a repulsive interacting 87 Rb Bose Einstein condensate (BEC) in a ring potential trap. Our study has been focused in the analysis of the interference pattern that arises by the ... -
Dynamics of one-dimensional quantum droplets
(American Physical Society (APS), 2018-07-30)
Article
Accés obertThe structure and dynamics of one-dimensional binary Bose gases forming quantum droplets is studied by solving the corresponding amended Gross-Pitaevskii equation. Two physically different regimes are identified, corresponding ... -
Estimation of the condensate fraction from the static structure factor
(American Physical Society (APS), 2021-03-16)
Article
Accés obertWe 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 ... -
Few trapped quantum dipoles: quantum versus classical structures
(2018-01-31)
Article
Accés obertWe 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 ... -
Gap solitons in a spin-orbit-coupled bose-einstein condensate
(2013-08)
Article
Accés obertWe report a diversity of stable gap solitons in a spin-orbit-coupled Bose-Einstein condensate subject to a spatially periodic Zeeman field. It is shown that the solitons can be classified by the main physical symmetries ... -
Ground-state properties of a dilute homogeneous Bose gas of hard disks in two dimensions
(2005-03-10)
Article
Accés obertThe energy and structure of a dilute hard-disks Bose gas are studied in the framework of a variational many-body approach based on a Jastrow correlated ground-state wave function. The asymptotic behaviors of the radial ... -
Heating a dipolar quantum fluid into a solid
(2023-04-04)
Article
Accés obertRaising the temperature of a material enhances the thermal motion of particles. Such an increase in thermal energy commonly leads to the melting of a solid into a fluid and eventually vaporises the liquid into a gaseous ... -
Interferometric measurement of interhyperfine scattering lengths in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Rb</mml:mi><mml:mprescripts /><mml:none /><mml:mn>87</mml:mn></mml:mmultiscripts></mml:math>
(American Physical Society (APS), 2019-09-10)
Article
Accés obertWe present interferometeric measurements of the f = 1 to f = 2 interhyperfine scattering lengths in a single-domain spinor Bose-Einstein condensate of 87Rb. The interhyperfine interaction leads to a strong and state-dependent ... -
Ionic polaron in a Bose-Einstein condensate
(2021-05-11)
Article
Accés obertThe presence of strong interactions in a many-body quantum system can lead to a variety of exotic effects. Here we show that even in a comparatively simple setup consisting of a charged impurity in a weakly interacting ...