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SUMMARY:Time-Resolved Collapse and Revival of the Heavy-Fermion State by P
 ulsed Light - Michael Turaev\, University of Bonn
DTSTART:20250611T100000Z
DTEND:20250611T110000Z
UID:TALK233401@talks.cam.ac.uk
CONTACT:Gaurav
DESCRIPTION:The collapse of the Kondo regime\, followed by a delayed THz p
 ulse emission upon its recovery has been observed in recent THz spectrosco
 py experiments on heavy-fermion compounds such as CeCu$_{6-x}$Au$_{x}$. Th
 is work provides a theoretical framework to describe the non-equilibrium d
 ynamics by employing the Anderson lattice model\, time-dependent non-equil
 ibrium dynamical mean-field theory\, and the non-crossing approximation. W
 e identify two key non-equilibrium mechanisms that play pivotal roles in t
 he collapse and subsequent revival of Kondo coherence. First due to the pu
 lse intensity the hybridization between localized $f$-electrons and conduc
 tion electrons increases\, shifting the system to a mixed-valence regime\,
  leading to a rapid destruction of the Kondo state. Second\, while the dis
 tribution function and the single-particle peak recover quickly\, the Kond
 o peak requires significantly more time due to the intrinsic low-energy ef
 fects associated with Kondo physics. Additionally\, we confirm the system'
 s ability to emit a non-superradiant delayed pulse upon the recovery of th
 e Kondo regime\, confirming the many-body origin of the experimentally obs
 erved delayed pulse.
LOCATION:Seminar Room 2\, RDC
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