Radiofrequency spectroscopy of one-dimensional trapped Bose polarons: crossover from the adiabatic to the diabatic regime

Abstract

We investigate the crossover of the impurity-induced dynamics, in trapped one-dimensional Bose polarons subject to radio frequency (rf) pulses of varying intensity, from an adiabatic to a diabatic regime. Utilizing adiabatic pulses for either weak repulsive or attractive impurity-medium interactions, a multitude of polaronic excitations or mode-couplings of the impurity-bath interaction with the collective breathing motion of the bosonic medium are spectrally resolved. We find that for strongly repulsive impurity-bath interactions, a temporal orthogonality catastrophe manifests in resonances in the excitation spectra where impurity coherence vanishes. When two impurities are introduced, impurity-impurity correlations, for either attractive or strong repulsive couplings, induce a spectral shift of the resonances with respect to the single impurity. For a heavy impurity, the polaronic peak is accompanied by a series of equidistant side-band resonances, related to interference of the impurity spin dynamics and the sound waves of the bath. In all cases, we enter the diabatic transfer regime for an increasing bare Rabi frequency of the rf field with a Lorentzian spectral shape featuring a single polaronic resonance. The findings in this work on the effects of external trap, rf pulse and impurity-impurity interaction should have implications for the new generations of cold-atom experiments.

23 pages, 11 figures

References in corpus (9)

• Many-Body Physics with Ultracold Gases
• Attractive and repulsive Fermi polarons in two dimensions
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• Time dependent impurity in ultracold fermions: orthogonality catastrophe and beyond
• Reduced density matrices and coherence of trapped interacting bosons
• Polaronic atom-trimer continuity in three-component Fermi gases
• The normal phase of an imbalanced Fermi gas
• Perpetual motion and driven dynamics of a mobile impurity in a quantum fluid
• Pulse and continuously driven many-body quantum dynamics of bosonic impurities in a Bose-Einstein condensate

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• Correlated dynamics of collective droplet excitations in a one-dimensional harmonic trap
• Theoretical and numerical evidence for the potential realization of the Peregrine soliton in repulsive two-component Bose-Einstein condensates
• Pattern formation in one-dimensional polaron systems and temporal orthogonality catastrophe
• Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron
• Artificial atoms from cold bosons in one dimension
• Entangling lattice-trapped bosons with a free impurity: impact on stationary and dynamical properties
• Intra- and interband excitations induced residue decay of the Bose polaron in a one-dimensional double-well
• Counterflow of lattice polarons in harmonically confined optical lattices
• Dynamical formation of two-fold fragmented many-body state induced by an impurity in a double-well
• Competition of light- and phonon-dressing in microwave-dressed Bose polarons
• Quasiparticle nature of the Bose polaron at finite temperature