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Doublon bottleneck in the ultrafast relaxation dynamics of hot electrons in 1TTaS2

I. Avigo, F. Queisser, P. Zhou, M. Ligges, K. Rossnagel, R. Schützhold, and U. Bovensiepen
Phys. Rev. Research 2, 022046(R) – Published 1 June 2020
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Abstract

Employing time-resolved photoelectron spectroscopy we analyze the relaxation dynamics of hot electrons in the charge density wave/Mott material 1TTaS2. At 1.2 eV above the Fermi level we observe a hot electron lifetime of 12±5 fs in the metallic state and of 60±10 fs in the broken symmetry ground state—a direct consequence of the reduced phase space for electron-electron scattering determined by the Mott gap. Boltzmann equation calculations which account for the interaction of hot electrons in a Bloch band with a doublon-holon excitation in the Mott state provide insight into the unoccupied electronic structure in the correlated state.

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  • Received 26 July 2019
  • Revised 7 May 2020
  • Accepted 11 May 2020

DOI:https://doi.org/10.1103/PhysRevResearch.2.022046

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

I. Avigo1, F. Queisser1,2,3, P. Zhou1, M. Ligges1,*, K. Rossnagel4,5,6, R. Schützhold1,2,3,†, and U. Bovensiepen1,‡

  • 1Fakultät für Physik, Universität Duisburg-Essen, Lotharstrasse 1, 47057 Duisburg, Germany
  • 2Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
  • 3Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany
  • 4Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
  • 5Ruprecht-Haensel-Labor, Christian-Albrechts-Universität zu Kiel und Deutsches Elektronen-Synchrotron DESY, 24098 Kiel and 22607 Hamburg, Germany
  • 6Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany

  • *Present address: Fraunhofer IMS, 47057 Duisburg, Germany.
  • r.schuetzhold@hzdr.de
  • uwe.bovensiepen@uni-due.de

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Vol. 2, Iss. 2 — June - August 2020

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