Exploració per autor "Astrakharchik, Grigori"
Ara es mostren els items 5-24 de 59
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Coherent oscillations in small Fermi-polaron systems
(AMER PHYSICAL SOC, 2017-12-01)
Article
Accés obertWe 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
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 ... -
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 ... -
Dark-soliton-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas [Dataset]
(Universitat Politècnica de Catalunya, 2021-10-05)
Conjunt de dades
Accés obert -
Distinguishability, degeneracy, and correlations in three harmonically trapped bosons in one dimension
(2014-12-01)
Article
Accés obertWe 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
Accés obertWe 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
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 ... -
Exact ground-state properties of a one-dimensional Coulomb gas
(2011-04-15)
Article
Accés obertThe 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
Accés obertWe 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
Accés obertWe 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
Accés obertWe 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
Accés obert2D 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
Accés obertWe 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
Accés obertWe 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
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 ... -
Liquid state of one-dimensional Bose mixtures: a quantum Monte Carlo study
(American Institute of Physics (AIP), 2019-03-14)
Article
Accés obertBy using exact quantum Monte Carlo methods we calculate the ground-state properties of the liquid phase in one-dimensional Bose mixtures with contact interactions. We find that the liquid state can be formed if the ratio ... -
Low-dimensional weakly interacting Bose gases: nonuniversal equations of state
(2010-01)
Article
Accés obertThe zero-temperature equation of state is analyzed in low-dimensional bosonic systems. We propose to use the concept of energy-dependent s-wave scattering length for obtaining estimations of nonuniversal terms in the energy ... -
Luttinger-liquid behavior of one-dimensional He-3
(2014-12-30)
Article
Accés obertThe ground-state properties of one-dimensional He-3 are studied using quantum Monte Carlo methods. The equation of state is calculated in a wide range of physically relevant densities and is well interpolated by a power-series ...
