SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 9: Poster Session: Correlated Electrons
TT 9.15: Poster
Tuesday, September 28, 2021, 13:30–16:00, P
Terahertz conductivity of heavy-fermion systems from time-resolved spectroscopy — •Chia-Jung Yang1, Shovon Pal1, Farzaneh Zamani2, Kristin Kliemt3, Cornelius Krellner3, Oliver Stockert4, Hilbert v. Löhneysen5, Johann Kroha2, and Manfred Fiebig1 — 1ETH Zurich, Switzerland — 2University of Bonn, Germany — 3Goethe-University Frankfurt, Germany — 4MPI CPfS Dresden, Germany — 5KIT Karlsruhe, Germany
Ultrafast terahertz (THz) spectroscopy has recently been introduced as a novel tool to investigate the quasiparticle dynamics across the quantum phase transition in heavy-fermion compounds [1,2]. The incident THz pulse with a spectral range of 0.1–3 THz creates collective intraband excitations within the heavy band as well as resonant interband transitions between the hybridizing heavy and light parts of the conduction band. The former leaves the heavy quasiparticles intact, while the latter breaks the Kondo-singlet and leads to a time-delayed echo-like response [1,2]. In this contribution, we expand our investigations towards the individual transport properties of strongly and weakly correlated electrons. We utilize the time-resolved, phase-sensitive THz spectroscopy to separate two types of excitations and derive the associated optical conductivity. We find that the Kondo-singlet-breaking interband transitions do not create a conventional metallic Drude peak, while the Kondo-retaining intraband excitations yield the Drude response as expected [3].
[1] C. Wetli et al., Nat. Phys. 14, 1103 (2018)
[2] S. Pal et al., PRL 122, 096401 (2019)
[3] C.-J. Yang et al., PRR 2, 033296 (2020)