Correlated dynamics of fermionic impurities induced by the counterflow of an ensemble of fermions

Abstract

We investigate the nonequilibrium quantum dynamics of a single and two heavy fermionic impurities being harmonically trapped and repulsively interacting with a finite ensemble of majority fermions. A quench of the potential of the majority species from a double-well to a harmonic trap is applied, enforcing its counterflow which in turn perturbs the impurities. For weak repulsions it is shown that the mixture undergoes a periodic mixing and demixing dynamics, while stronger interactions lead to a more pronounced dynamical spatial separation. In the presence of correlations the impurity exhibits an expansion dynamics which is absent in the Hartree-Fock case resulting in an enhanced degree of miscibility. We generalize our results to different impurity masses and demonstrate that the expansion amplitude of the impurity reduces for a larger mass. Furthermore, we showcase that the majority species is strongly correlated and a phase separation occurs on the two-body level. Most importantly, signatures of attractive impurity-impurity induced interactions mediated by the majority species are identified in the time-evolution of the two-body correlations of the impurities, a result that is supported by inspecting their spatial size.

21 pages, 14 figures

References in corpus (33)

• Many-Body Physics with Ultracold Gases
• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Theory of ultracold Fermi gases
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Attractive and repulsive Fermi polarons in two dimensions
• Double species condensate with tunable interspecies interactions
• Generation of dark-bright soliton trains in superfluid-superfluid counterflow
• Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K
• Experimental observation of oscillating and interacting matter wave dark solitons
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• Degenerate Bose-Bose mixture in a three-dimensional optical lattice
• 39-K Bose-Einstein condensate with tunable interactions
• Time dependent impurity in ultracold fermions: orthogonality catastrophe and beyond
• Ultracold Fermionic Feshbach Molecules of ${}^{23}$Na${}^{40}$K
• Tuning of heteronuclear interactions in a quantum-degenerate Fermi-Bose mixture
• Reduced density matrices and coherence of trapped interacting bosons
• Suppression of Quantum Scattering in Strongly Confined Systems
• Short-range correlations and entropy in ultracold atomic Fermi gases
• Fate of the Bose polaron at finite temperature
• Many-body quantum dynamics and induced correlations of Bose polarons
• Quench-induced resonant tunneling mechanisms of bosons in an optical lattice with harmonic confinement
• Dissipative correlated dynamics of a moving impurity immersed in a Bose-Einstein Condensate
• Induced pairing of fermionic impurities in a one-dimensional strongly correlated Bose gas
• Quantum Breathing Mode of Interacting Particles in a One-dimensional Harmonic Trap
• Correlated quantum dynamics of two quenched fermionic impurities immersed in a Bose-Einstein Condensate
• Coherent Oscillations in Small Fermi Polaron Systems
• Entanglement-assisted tunneling dynamics of impurities in a double well immersed in a bath of lattice trapped bosons
• Dynamics of relaxation and dressing of a quenched Bose polaron
• Pulse and continuously driven many-body quantum dynamics of bosonic impurities in a Bose-Einstein condensate
• Dynamical Pruning of the Non-Equilibrium Quantum Dynamics of Trapped Ultracold Bosons
• Geometry-induced entanglement in a mass-imbalanced few-fermion system
• Controlling quantum coherence of a two-component Bose-Einstein condensate via an impurity atom
• Two- and three-body effective potentials between impurities in ideal BEC

Cited by in corpus (16)

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• Polaron Problems in Ultracold Atoms: Role of a Fermi Sea across Different Spatial Dimensions and Quantum Fluctuations of a Bose Medium
• Static and dynamic properties of a few spin $1/2$ interacting fermions trapped in an harmonic potential
• Counterflow dynamics of two correlated impurities immersed in a bosonic gas
• Induced interactions and quench dynamics of bosonic impurities immersed in a Fermi sea
• Many-body effects on second-order phase transitions in spinor Bose-Einstein condensates and breathing dynamics
• Pattern formation of correlated impurities subjected to an impurity-medium interaction pulse
• Collisional dynamics of polaronic clouds immersed in a Fermi sea
• A Non-Gaussian Variational Approach to Fermi Polarons in One- and Two-dimensional Lattices
• Finite-range effects in the two-dimensional repulsive Fermi polaron
• Spectral properties of a three body atom-ion hybrid system
• Extracting non-local inter-polaron interactions from collisional dynamics
• Impurity with a resonance in the vicinity of the Fermi energy
• Intra- and interband excitations induced residue decay of the Bose polaron in a one-dimensional double-well
• Fermi polaron in a dissipative bath with spin-orbit coupling
• Several fermions strongly interacting with a heavy mobile impurity in a one-dimensional harmonic trap