Now showing items 1-20 of 55

• #### Andreev-Bashkin effect in superfluid cold gases mixtures ﻿

(2017-12-05)
Article
Open Access
© 2017 The Author(s). Published by IOP Publishing Ltd on behalf of Deutsche Physikalische Gesellschaft. We study a mixture of two superfluids with density-density and current-current (Andreev-Bashkin) interspecies interactions. ...
• #### Beyond Lee-Huang-Yang description of self-bound Bose mixtures ﻿

(2020-08-18)
Article
Open Access
We investigate the properties of self-bound ultradilute Bose-Bose mixtures, beyond the Lee-Huang-Yang description. Our approach is based on the determination of the beyond mean-field corrections to the phonon modes of the ...
• #### Beyond-Luttinger-liquid thermodynamics of a one-dimensional Bose gas with repulsive contact interactions ﻿

(American Physical Society, 2019-11-07)
Article
Open Access
We present a thorough study of the thermodynamics of a one-dimensional repulsive Bose gas, focusing in particular on corrections beyond the Luttinger-liquid description. We compute the chemical potential, pressure, and ...
• #### Bose polarons in ultracold atoms in one dimension: beyond the Fröhlich paradigm ﻿

(2017-10-25)
Article
Open Access
Mobile 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 ...
• #### Coherent oscillations in small Fermi-polaron systems ﻿

(AMER PHYSICAL SOC, 2017-12-01)
Article
Open Access
We study the ground state and excitations of a one-dimensional trapped polarized Fermi gas interacting with a single impurity. First, we study the tunneling dynamics of the impurity through a potential barrier, such as one ...
• #### Collective excitations of a one-dimensional quantum droplet ﻿

(2020-05-21)
Article
Open Access
We 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 ...
• #### Composite boson description of a low-density gas of excitons ﻿

(2017-10-13)
Article
Open Access
Ground-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 ...
• #### Dark-soliton-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas [Dataset] ﻿

(Universitat Politècnica de Catalunya, 2021-10-05)
Dataset
Open Access
• #### Distinguishability, degeneracy, and correlations in three harmonically trapped bosons in one dimension ﻿

(2014-12-01)
Article
Open Access
We study a system of two bosons of one species and a third atom of a second species in a one-dimensional parabolic trap at zero temperature. We assume contact repulsive inter- and intraspecies interactions. By means of an ...
• #### Dynamic structure function of a cold Fermi gas at unitarity ﻿

(Institute of Physics (IOP), 2014-08-14)
Article
Open Access
We present a theoretical study of the dynamic structure function of a resonantly interacting two-component Fermi gas at zero temperature. Our approach is based on dynamic many-body theory able to describe excitations in ...
• #### Dynamics of one-dimensional quantum droplets ﻿

(American Physical Society (APS), 2018-07-30)
Article
Open Access
The 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
Open Access
We 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 ...
• #### Exact ground-state properties of a one-dimensional Coulomb gas ﻿

(2011-04-15)
Article
Open Access
The ground-state properties of a single-component one-dimensional Coulomb gas are investigated. We use Bose-Fermi mapping for the ground-state wave function which permits solution of the Fermi sign problem in the following ...
• #### Exact results for the boundary energy of one-dimensional bosons ﻿

(American Institute of Physics (AIP), 2019-12-17)
Article
Open Access
We study bosons in a one-dimensional hard-wall box potential. In the case of contact interaction, the system is exactly solvable by the Bethe ansatz, as first shown by Gaudin in 1971. Although contained in the exact solution, ...
• #### Exactly solvable system of one-dimensional trapped bosons with short- and long-range interactions ﻿

(American Institute of Physics (AIP), 2020-11-25)
Article
Open Access
We introduce a model of trapped bosons with contact interactions as well as Coulomb repulsion or gravitational attraction in one spatial dimension. We find the exact ground-state energy and many-body wave function. The ...
• #### Few-body bound states of two-dimensional bosons ﻿

(American Physical Society (APS), 2020-04-07)
Article
Open Access
We study clusters of the type $A_NB_M$ with N=M=3 in a two-dimensional mixture of A and B bosons, with attractive AB and equally repulsive AA and BB interactions. In order to check universal aspects of the problem, we ...
• #### Frontiers in Multidimensional Self-Trapping of Nonlinear Fields and Matter ﻿

(Nature, 2019-02-22)
Article
Open Access
2D and 3D solitons and related states, such as quantum droplets, can appear in optical systems, atomic Bose–Einstein condensates (BECs) and liquid crystals, among other physical settings. However, multidimensional solitary ...
• #### Gapped spectrum in pair-superfluid bosons ﻿

(2016-12-22)
Article
Open Access
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 ...
• #### Hole-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas ﻿

(2022-08-26)
Article
Open Access
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 ...
• #### Ionic polaron in a Bose-Einstein condensate ﻿

(2021-05-11)
Article
Open Access
The 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 ...