Time-Resolved Collapse and Revival of the Heavy-Fermion State by Pulsed Light

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• Michael Turaev, University of Bonn
• Monday 09 June 2025, 11:00-12:00
• Seminar Room 3, RDC.

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The collapse of the Kondo regime, followed by a delayed THz pulse emission upon its recovery has been observed in recent THz spectroscopy experiments on heavy-fermion compounds such as CeCu$$Au${x}$. This work provides a theoretical framework to describe the non-equilibrium dynamics by employing the Anderson lattice model, time-dependent non-equilibrium dynamical mean-field theory, and the non-crossing approximation. We identify two key non-equilibrium mechanisms that play pivotal roles in the collapse and subsequent revival of Kondo coherence. First due to the pulse intensity the hybridization between localized $f$-electrons and conduction electrons increases, shifting the system to a mixed-valence regime, leading to a rapid destruction of the Kondo state. Second, while the distribution function and the single-particle peak recover quickly, the Kondo peak requires significantly more time due to the intrinsic low-energy effects associated with Kondo physics. Additionally, we confirm the system’s ability to emit a non-superradiant delayed pulse upon the recovery of the Kondo regime, confirming the many-body origin of the experimentally observed delayed pulse.

This talk is part of the Theory of Condensed Matter series.

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