Philip Hofmann

Electron-phonon coupling in single-layer MoS2

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DOI

  • Sanjoy K. Mahatha, Deutsches Elektronen-Synchrotron (DESY)
  • ,
  • Arlette S. Ngankeu
  • ,
  • Nicki Frank Hinsche
  • ,
  • Ingrid Mertig
  • ,
  • Kevin Guilloy
  • ,
  • Peter L. Matzen
  • ,
  • Marco Bianchi
  • Charlotte E. Sanders, Central Laser Facility, STFC Rutherford Appleton Laboratory
  • ,
  • Jill A. Miwa
  • Harsh Bana
  • ,
  • Elisabetta Travaglia
  • ,
  • Paolo Lacovig
  • ,
  • Luca Bignardi
  • ,
  • Daniel Lizzit
  • ,
  • Rosanna Larciprete
  • ,
  • Alessandro Baraldi
  • ,
  • Silvano Lizzit
  • ,
  • Philip Hofmann
The electron-phonon coupling strength in the spin-split valence band maximum of single-layer MoS$_2$ is studied using angle-resolved photoemission spectroscopy and density functional theory-based calculations. Values of the electron-phonon coupling parameter $\lambda$ are obtained by measuring the linewidth of the spin-split bands as a function of temperature and fitting the data points using a Debye model. The experimental values of $\lambda$ for the upper and lower spin-split bands at K are found to be 0.05 and 0.32, respectively, in excellent agreement with the calculated values for a free-standing single-layer MoS$_2$. The results are discussed in the context of spin and phase-space restricted scattering channels, as reported earlier for single-layer WS$_2$ on Au(111). The fact that the absolute valence band maximum in single-layer MoS$_2$ at K is almost degenerate with the local valence band maximum at $\Gamma$ can potentially be used to tune the strength of the electron-phonon interaction in this material.
OriginalsprogEngelsk
TidsskriftSurface Science
Vol/bind681
Sider (fra-til)64-69
ISSN0039-6028
DOI
StatusUdgivet - mar. 2019

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