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Coupling between adsorbate vibrations and an electronic surface state

Rotenberg1, Schaefer, Kevan

  • 1MS 2-400, Advanced Light Source, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

Physical Review Letters
|October 6, 2000
PubMed
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We observed coupling between hydrogen vibrations and a surface band on W(110). This electron-phonon coupling is stronger than in bulk tungsten and depends on surface state localization.

Area of Science:

  • Surface science
  • Condensed matter physics
  • Spectroscopy

Background:

  • Adsorbed hydrogen on metal surfaces exhibits unique vibrational properties.
  • Surface states on transition metals like tungsten (W) play a crucial role in surface phenomena.
  • Electron-phonon coupling significantly influences material properties.

Purpose of the Study:

  • To directly measure the coupling between adsorbed hydrogen's symmetric stretch vibration and a surface band on W(110).
  • To investigate the nature and strength of electron-phonon coupling at the W(110) surface.
  • To understand the relationship between surface state localization and electron-phonon coupling.

Main Methods:

  • Angle-resolved photoemission spectroscopy (ARPES) was employed.
  • Measurements were performed on hydrogen adsorbed on a W(110) surface.

Related Experiment Videos

  • Hydrogen/deuterium isotope effect was utilized to confirm the coupling mechanism.

    • Main Results:

    • Direct evidence of coupling between the hydrogen symmetric stretch mode and a W(110) surface band was observed.
    • The surface band splits into two branches due to this coupling, with energy comparable to the vibrational mode.
    • A significant hydrogen/deuterium isotope effect confirmed the vibrational origin of the observed splitting.
    • The electron-phonon coupling parameter (lambda) for the surface state was found to be substantially larger than that for bulk W.
    • A strong correlation was found between the electron-phonon coupling strength and the surface localization of the surface state wave function.

    Conclusions:

    • The study provides direct experimental evidence of strong electron-phonon coupling involving adsorbed hydrogen vibrations on W(110).
    • The observed coupling significantly modifies the electronic structure of the surface state.
    • The findings highlight the importance of surface state localization in determining electron-phonon interaction strength at surfaces.