Anderson orthogonality scaling in the Rabi-driven heavy Fermi polaron

Abstract:The Anderson orthogonality catastrophe (AOC) is a paradigmatic many-body phenomenon in which a local perturbation induces a macroscopic response of a Fermi sea. We probe signatures of the AOC by coherently driving heavy Fermi polarons in an ultracold $^6$Li-$^{133}$Cs mixture. We observe a power-law dependence of the measured Rabi frequency on the drive strength, with exponents consistent with AOC predictions. Finite-temperature simulations quantitatively reproduce the observed scaling, indicating that AOC signatures persist beyond the idealized zero-temperature, infinite-mass limit. The damping of the Rabi oscillations provides access to polaron dephasing and reveals a nonmonotonic drive dependence, qualitatively consistent with current theories. Our results establish coherently driven impurities as a versatile probe of quantum many-body dynamics through local coherent control.

Quantum Gases (cond-mat.quant-gas); Quantum Physics (quant-ph)

arXiv:2609.09129 [cond-mat.quant-gas]

(or arXiv:2609.09129v1 [cond-mat.quant-gas] for this version)

https://doi.org/10.48550/arXiv.2609.09129 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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