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Alfred Jones

Transient hot electron dynamics in single-layer TaS2

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  • Federico Andreatta
  • ,
  • Habib Rostami, NORDITA
  • ,
  • Antonija Grubišić Čabo, Aarhus Universitet
  • ,
  • Marco Bianchi
  • Charlotte E. Sanders, Rutherford Appleton Laboratory
  • ,
  • Deepnarayan Biswas
  • Cephise Cacho, Rutherford Appleton Laboratory
  • ,
  • Alfred J.H. Jones
  • Richard T. Chapman, Rutherford Appleton Laboratory
  • ,
  • Emma Springate, Rutherford Appleton Laboratory
  • ,
  • Phil D.C. King, University of St Andrews
  • ,
  • Jill A. Miwa
  • Alexander Balatsky, NORDITA, Los Alamos National Laboratory
  • ,
  • Søren Ulstrup
  • Philip Hofmann

Using time- and angle-resolved photoemission spectroscopy, we study the response of metallic single-layer TaS2 in the 1H structural modification to the generation of excited carriers by a femtosecond laser pulse. A complex interplay of band structure modifications and electronic temperature increase is observed and analyzed by direct fits of model spectral functions to the two-dimensional (energy and k-dependent) photoemission data. Upon excitation, the partially occupied valence band is found to shift to higher binding energies by up to ≈100meV, accompanied by electronic temperatures exceeding 3000 K. These observations are explained by a combination of temperature-induced shifts of the chemical potential, as well as temperature-induced changes in static screening. Both contributions are evaluated in a semiempirical tight-binding model. The shift resulting from a change in the chemical potential is found to be dominant.

OriginalsprogEngelsk
Artikelnummer165421
TidsskriftPhysical Review B
Vol/bind99
Nummer16
Antal sider9
ISSN2469-9950
DOI
StatusUdgivet - 2019

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