Journal article

Ultrafast doublon dynamics in photoexcited $1T$-${\mathrm{TaS}}_{2}$

  • Ligges, M. Faculty of Physics, University of Duisburg-Essen, Germany
  • Avigo, I. Faculty of Physics, University of Duisburg-Essen, Germany
  • Golež, Denis Department of Physics, University of Fribourg, Switzerland
  • Strand, Hugo U. R. Department of Physics, University of Fribourg, Switzerland
  • Beyazit, Y. Faculty of Physics, University of Duisburg-Essen, Germany
  • Hanff, K. Institute of Experimental and Applied Physics, University of Kiel, Germany
  • Diekmann, F. Institute of Experimental and Applied Physics, University of Kiel, Germany
  • Stojchevska, L. Faculty of Physics, University of Duisburg-Essen, Germany
  • Kalläne, M. Institute of Experimental and Applied Physics, University of Kiel, Germany
  • Zhou, P. Faculty of Physics, University of Duisburg-Essen, Germany
  • Rossnagel, K. Institute of Experimental and Applied Physics, University of Kiel, Germany
  • Eckstein, Martin Max Planck Research Department for Structural Dynamics, University of Hamburg, Germany
  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
  • Bovensiepen, U. Faculty of Physics, University of Duisburg-Essen, Germany
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    18.04.2018
Published in:
  • Physical Review Letters. - 2018, vol. 120, no. 16, p. 166401
English Strongly correlated materials exhibit intriguing properties caused by intertwined microscopic interactions that are hard to disentangle in equilibrium. Employing nonequilibrium time-resolved photoemission spectroscopy on the quasi-two- dimensional transition-metal dichalcogenide 1T-TaS2, we identify a spectroscopic signature of doubly occupied sites (doublons) that reflects fundamental Mott physics. Doublon-hole recombination is estimated to occur on timescales of electronic hopping ℏ/J≈14 fs. Despite strong electron-phonon coupling, the dynamics can be explained by purely electronic effects captured by the single-band Hubbard model under the assumption of weak hole doping, in agreement with our static sample characterization. This sensitive interplay of static doping and vicinity to the metal- insulator transition suggests a way to modify doublon relaxation on the few- femtosecond timescale.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/307203
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