Anderson orthogonality scaling in the Rabi-driven heavy Fermi polaron

Michael Rautenberg; Tobias Krom; Eugen Dizer; Olivier Bleu; Eleonora Lippi; Tilman Enss; Manfred Salmhofer; Lauriane Chomaz; Matthias Weidemüller

arXiv · 2609.09129

Anderson orthogonality scaling in the Rabi-driven heavy Fermi polaron

Michael Rautenberg·Tobias Krom·Eugen Dizer·Olivier Bleu·Eleonora Lippi·Tilman Enss·Manfred Salmhofer·Lauriane Chomaz·Matthias Weidemüller

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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.

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Michael Rautenberg, Tobias Krom, Eugen Dizer, Olivier Bleu, Eleonora Lippi, Tilman Enss, Manfred Salmhofer, Lauriane Chomaz, Matthias Weidemüller. 2026-09-08. Anderson orthogonality scaling in the Rabi-driven heavy Fermi polaron. https://arxiv.org/abs/2609.09129

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