Repulsive Fermi Polarons and Their Induced Interactions in Binary Mixtures of Ultracold Atoms

Abstract

We explore repulsive Fermi polarons in one-dimensional harmonically trapped few-body mixtures of ultracold atoms using as a case example a ${}^6$Li-${}^{40}$K mixture. A characterization of these quasiparticle-like states, whose appearance is signalled in the impurity's radiofrequency spectrum, is achieved by extracting their lifetime and residua. Increasing the number of ${}^{40}$K impurities leads to the occurrence of both single and multiple polarons that are entangled with their environment. An interaction-dependent broadening of the spectral lines is observed suggesting the presence of induced interactions. We propose the relative distance between the impurities as an adequate measure to detect induced interactions independently of the specifics of the atomic mixture, a result that we showcase by considering also a ${}^6$Li-${}^{173}$Yb system. This distance is further shown to be indicative of the generation of entanglement independently of the size of the bath (${}^6$Li) and the atomic species of the impurity. The generation of entanglement and the importance of induced interactions are revealed with an emphasis on the regime of intermediate interaction strengths.

14 pages, 7 figures

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• One-dimensional mixtures of several ultracold atoms: a review
• Quench Dynamics and Orthogonality Catastrophe of Bose Polarons
• Few-body Bose gases in low dimensions -- a laboratory for quantum dynamics
• Many-body quantum dynamics and induced correlations of Bose polarons
• Induced correlations between impurities in a one-dimensional quenched Bose gas
• Dynamical variational approach to Bose polarons at finite temperatures
• Dissipative correlated dynamics of a moving impurity immersed in a Bose-Einstein Condensate
• Polaron Problems in Ultracold Atoms: Role of a Fermi Sea across Different Spatial Dimensions and Quantum Fluctuations of a Bose Medium
• Thermal crossover, transition, and coexistence in Fermi polaronic spectroscopies
• Rydberg impurity in a Fermi gas: Quantum statistics and rotational blockade
• Correlated quantum dynamics of two quenched fermionic impurities immersed in a Bose-Einstein Condensate
• Probing Ferromagnetic Order in Few-Fermion Correlated Spin-Flip Dynamics
• Doping a lattice-trapped bosonic species with impurities: From ground state properties to correlated tunneling dynamics
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• Pump Probe Spectroscopy of Bose Polarons: Dynamical Formation and Coherence
• Interactions mediated by atoms, photons, electrons, and excitons
• Mesoscopic spin transport between strongly interacting Fermi gases
• In-medium bound states of two bosonic impurities in a one-dimensional Fermi gas
• Polarons and their induced interactions in highly imbalanced triple mixtures
• Static and dynamic properties of a few spin $1/2$ interacting fermions trapped in an harmonic potential
• Emergence of a sharp quantum collective mode in a one-dimensional Fermi polaron
• Correlated dynamics of fermionic impurities induced by the counterflow of an ensemble of fermions
• Quantum-limited thermometry of a Fermi gas with a charged spin particle
• Pattern formation in one-dimensional polaron systems and temporal orthogonality catastrophe
• Counterflow dynamics of two correlated impurities immersed in a bosonic gas
• Induced interactions and quench dynamics of bosonic impurities immersed in a Fermi sea
• Pulse and continuously driven many-body quantum dynamics of bosonic impurities in a Bose-Einstein condensate
• Radiofrequency spectroscopy of one-dimensional trapped Bose polarons: crossover from the adiabatic to the diabatic regime
• Interaction induced single impurity tunneling in a binary mixture of trapped ultracold bosons
• The ground state of polaron in an ultracold dipolar Fermi gas
• Interplay of phase separation and itinerant magnetism for correlated few fermions in a double-well
• Many-body effects on second-order phase transitions in spinor Bose-Einstein condensates and breathing dynamics
• Collisional dynamics of polaronic clouds immersed in a Fermi sea
• Superfluidity fraction of few bosons in an annular geometry in the presence of a rotating weak link
• Ion-induced interactions in a Tomonaga-Luttinger liquid
• Complex Langevin study for polarons in an attractively interacting one-dimensional two-component Fermi gas
• Low-Dimensional Fluctuations and Pseudogap in Gaudin-Yang Fermi Gases
• Fermi spin polaron and dissipative Fermi-polaron Rabi dynamics
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• Bose-like few-fermion systems
• Few particles with an impurity in a one-dimensional harmonic trap
• Effective two- and three-body interactions between dressed impurities in a tilted double-well potential
• Impurity immersed in a two-component few-fermion mixture in a one-dimensional harmonic trap
• Few strongly interacting fermions of different mass driven in the vicinity of a critical point
• Several fermions strongly interacting with a heavy mobile impurity in a one-dimensional harmonic trap