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Quantum acoustics—a recently developed framework parallel to quantum optics—establishes a nonperturbative and coherent treatment of the electron-phonon interaction in real space. The quantum-acoustical representation reveals a displaced Drude peak hiding in plain sight within the venerable Fröhlich model: the optical conductivity exhibits a finite frequency maximum in the far-infrared range and the dc conductivity is suppressed. Our results elucidate the origin of the high-temperature absorption peaks in strange or bad metals, revealing that dynamical lattice disorder steers the system towards a non-Drude behavior.Received 15 November 2023Accepted 18 March 2024DOI:https://doi.org/10.1103/PhysRevLett.132.186303© 2024 American Physical SocietyPhysics Subject Headings (PhySH)
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Keski-Rahkonen et al. (2024) studied this question.
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