Browsing by Author "Astrakharchik, Grigori"
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AndreevBashkin effect in superfluid cold gases mixtures
Nespolo, Jacopo; Astrakharchik, Grigori; Recati, Alessio (20171205)
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 densitydensity and currentcurrent (AndreevBashkin) interspecies interactions. ... 
Beyond LeeHuangYang description of selfbound Bose mixtures
Ota, Miki; Astrakharchik, Grigori (20200818)
Article
Open AccessWe investigate the properties of selfbound ultradilute BoseBose mixtures, beyond the LeeHuangYang description. Our approach is based on the determination of the beyond meanfield corrections to the phonon modes of the ... 
BeyondLuttingerliquid thermodynamics of a onedimensional Bose gas with repulsive contact interactions
Rosi, Giulia de; Massignan, Pietro Alberto; Lewenstein, Maciej; Astrakharchik, Grigori (American Physical Society, 20191107)
Article
Open AccessWe present a thorough study of the thermodynamics of a onedimensional repulsive Bose gas, focusing in particular on corrections beyond the Luttingerliquid description. We compute the chemical potential, pressure, and ... 
Bose polarons in ultracold atoms in one dimension: beyond the Fröhlich paradigm
Grusdt, Fabian; Astrakharchik, Grigori; Demler, Eugene (20171025)
Article
Open AccessMobile 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 Fermipolaron systems
Tylutki, Marek; Astrakharchik, Grigori; Recati, Alessio (AMER PHYSICAL SOC, 20171201)
Article
Open AccessWe study the ground state and excitations of a onedimensional 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 onedimensional quantum droplet
Tylutki, Marek; Astrakharchik, Grigori; Malomed, Boris A.; Petrov, D. S. (20200521)
Article
Open AccessWe calculate the excitation spectrum of a onedimensional selfbound quantum droplet in a twocomponent bosonic mixture described by the GrossPitaevskii equation (GPE) with cubic and quadratic nonlinearities. The cubic ... 
Composite boson description of a lowdensity gas of excitons
Golomedov, A. E.; Lozovik, Yu. E.; Astrakharchik, Grigori; Boronat Medico, Jordi (20171013)
Article
Open AccessGroundstate properties of a fermionic Coulomb gas are calculated using the fixednode diffusion Monte Carlo method. The validity of the composite boson description is tested for different densities. We extract the ... 
Darksolitoninduced anomaly in the thermodynamic behavior of a onedimensional Bose gas [Dataset]
Rosi, Giulia de; Rota, Riccardo; Astrakharchik, Grigori; Boronat Medico, Jordi (Universitat Politècnica de Catalunya, 20211005)
Dataset
Open Access 
Distinguishability, degeneracy, and correlations in three harmonically trapped bosons in one dimension
Garcia March, Miguel Angel; Julia Diaz, Bruno; Astrakharchik, Grigori; Boronat Medico, Jordi; Polls, A. (20141201)
Article
Open AccessWe study a system of two bosons of one species and a third atom of a second species in a onedimensional 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
Astrakharchik, Grigori; Boronat Medico, Jordi; Krotscheck, Eckhard; Lichtenegger, Thomas (Institute of Physics (IOP), 20140814)
Article
Open AccessWe present a theoretical study of the dynamic structure function of a resonantly interacting twocomponent Fermi gas at zero temperature. Our approach is based on dynamic manybody theory able to describe excitations in ... 
Dynamics of onedimensional quantum droplets
Astrakharchik, Grigori; Malomed, Boris A. (American Physical Society (APS), 20180730)
Article
Open AccessThe structure and dynamics of onedimensional binary Bose gases forming quantum droplets is studied by solving the corresponding amended GrossPitaevskii equation. Two physically different regimes are identified, corresponding ... 
Estimation of the condensate fraction from the static structure factor
Lozovik, Yu. E.; Kurbakov, I. L.; Astrakharchik, Grigori; Boronat Medico, Jordi (American Physical Society (APS), 20210316)
Article
Open AccessWe present an analytical method to estimate the condensate fraction n0/n in strongly correlated systems for which the zerotemperature static structure factor S(p) is known. The advantage of the proposed method is that it ... 
Exact groundstate properties of a onedimensional Coulomb gas
Astrakharchik, Grigori; Girardeau, M.D. (20110415)
Article
Open AccessThe groundstate properties of a singlecomponent onedimensional Coulomb gas are investigated. We use BoseFermi mapping for the groundstate wave function which permits solution of the Fermi sign problem in the following ... 
Exact results for the boundary energy of onedimensional bosons
Reichert, Benjamin; Astrakharchik, Grigori; Petkovic, Aleksandra; Ristivojevic, Zoran (American Institute of Physics (AIP), 20191217)
Article
Open AccessWe study bosons in a onedimensional hardwall 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 onedimensional trapped bosons with short and longrange interactions
Astrakharchik, Grigori (American Institute of Physics (AIP), 20201125)
Article
Open AccessWe 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 groundstate energy and manybody wave function. The ... 
Fewbody bound states of twodimensional bosons
Guijarro Gámez, Grecia; Astrakharchik, Grigori; Boronat Medico, Jordi; Bazak, Betzalel; Petrov, D. S. (American Physical Society (APS), 20200407)
Article
Open AccessWe study clusters of the type $A_NB_M$ with N=M=3 in a twodimensional 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 SelfTrapping of Nonlinear Fields and Matter
Kartashov, Yaroslav; Astrakharchik, Grigori; Malomed, Boris A.; Torner Sabata, Lluís (Nature, 20190222)
Article
Open Access2D 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 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 ... 
Ionic polaron in a BoseEinstein condensate
Astrakharchik, Grigori; Schmidt, Richard (20210511)
Article
Open AccessThe presence of strong interactions in a manybody 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 onedimensional Bose mixtures: a quantum Monte Carlo study
Parisi, L.; Astrakharchik, Grigori; Giorgini, Stefano (American Institute of Physics (AIP), 20190314)
Article
Open AccessBy using exact quantum Monte Carlo methods we calculate the groundstate properties of the liquid phase in onedimensional Bose mixtures with contact interactions. We find that the liquid state can be formed if the ratio ...