期刊
NEW JOURNAL OF PHYSICS
卷 23, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/abe9d5
关键词
Bose polarons; radiofrequency spectroscopy; correlations effects; spinor impurities
资金
- University of Hamburg
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [SFB-925, 170620586]
- Cluster of Excellence 'Advanced Imaging of Matter' of the Deutsche Forschungsgemeinschaft (DFG) [EXC 2056, 390715994]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC-2111-390814868]
- NSF for ITAMP at Harvard University
The study investigates the impurity-induced dynamics in trapped one-dimensional Bose polarons subject to radio frequency pulses, revealing various excitations and mode-couplings under different interactions, as well as spectral shifts induced by impurity-impurity correlations. The findings suggest implications for new cold-atom experiments involving external traps, RF pulses, and impurity-impurity interactions.
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.
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