Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M63: Heavy Fermions II
8:00 AM–10:48 AM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -Grant Park A
Sponsoring
Unit:
DCMP
Chair: John Singleton, NHMFL/ LANL
Abstract: M63.00013 : Ultrafast, coherent time evolution of terahertz-pumped heavy-fermion systems*
10:24 AM–10:36 AM
Presenter:
Francisco Meirinhos
(Universität Bonn)
Authors:
Francisco Meirinhos
(Universität Bonn)
Johann Kroha
(Universität Bonn)
In the present work we develop the theoretical description of the HF non-equilibrium dynamics. The matter fields are captured by an Anderson model described by a time-dependent version of the non-equilibrium Non-Crossing Approximaton. The THz photons are treated as a quantum field with its own dynamics and are coupled to the HF-system by a dipole interaction. In this way, not only can incident THz pulses with arbitrary pulse shape be considered but also the photon quantum dynamics allow for re-emission of radiation and, thereby, the necessary release of energy during the relaxation dynamics to the HF ground state. These coupled dynamics are solved by a newly developed adaptive two-time stepping algorithm [4] which captures the exponentially long memory time inherent to the system, given by τ*K. We also discuss the thermalisation to ambient temperature in terms of a Lindblad-like coupling to the electromagnetic environment as a bath.
*We acknowledge funding from the Deutsche Forschungsgemeinschaft (DFG) within the Cooperative Research Center SFB/TR 185 (277625399) and the Cluster of Excellence ML4Q (390534769).
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