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  Terahertz conductivity of heavy-fermion systems from time-resolved spectroscopy

Yang, C.-J., Pal, S., Zamani, F., Kliemt, K., Krellner, C., Stockert, O., et al. (2020). Terahertz conductivity of heavy-fermion systems from time-resolved spectroscopy. Physical Review Research, 2(3): 033296, pp. 1-11. doi:10.1103/PhysRevResearch.2.033296.

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 Creators:
Yang, Chia-Jung1, Author
Pal, Shovon1, Author
Zamani, Farzaneh1, Author
Kliemt, Kristin1, Author
Krellner, Cornelius1, Author
Stockert, Oliver2, Author              
Loehneysen V, Hilbert1, Author
Kroha, Johann1, Author
Fiebig, Manfred1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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Free keywords: QUANTUM CRITICALITY; TEMPERATURE; RESISTIVITY; COLLAPSE; FIELDPhysics;
 Abstract: The Drude model describes the free-electron conduction in simple metals, governed by the freedom that the mobile electrons have within the material. In strongly correlated systems, however, a significant deviation of the optical conductivity from the simple metallic Drude behavior is observed. Here, we investigate the optical conductivity of the heavy-fermion system CeCu6-xAux, using time-resolved, phase-sensitive terahertz spectroscopy. The terahertz electric field creates two types of excitations in heavy-fermion materials: First, the intraband excitations that leave the heavy quasiparticles intact. Second, the resonant interband transitions between the heavy and light parts of the hybridized conduction band that break the Kondo singlet. We find that the Kondo-singlet-breaking interband transitions do not create a Drude peak, while the Kondo-retaining intraband excitations yield the expected Drude response. This makes it possible to separate these two fundamentally different correlated contributions to the optical conductivity.

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Language(s): eng - English
 Dates: 2020-08-242020-08-24
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevResearch.2.033296
 Degree: -

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Title: Physical Review Research
Source Genre: Journal
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Publ. Info: College Park, Maryland, United States : American Physical Society (APS)
Pages: - Volume / Issue: 2 (3) Sequence Number: 033296 Start / End Page: 1 - 11 Identifier: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564