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Surface-state Stark shift in a scanning tunneling microscope.

L Limot1, T Maroutian, P Johansson

  • 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.

Physical Review Letters
|November 13, 2003
PubMed
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We quantitatively studied the Ag(111) surface state using scanning tunneling spectroscopy (STS). A tunable electric field revealed a Stark effect, shifting the surface-state binding energy, consistent with theoretical models.

Area of Science:

  • Surface science
  • Condensed matter physics
  • Scanning probe microscopy

Background:

  • The Ag(111) surface state is crucial for understanding surface electronic properties.
  • Scanning tunneling spectroscopy (STS) is a powerful tool for probing surface states.
  • The influence of electric fields on surface states requires precise investigation.

Purpose of the Study:

  • To quantitatively investigate the Ag(111) surface state using STS.
  • To explore the effect of a tunable electric field on the surface-state binding energy.
  • To compare experimental results with theoretical models.

Main Methods:

  • Quantitative low-temperature scanning tunneling spectroscopy (STS).
  • Utilizing an unprecedented range of tunneling currents (50 pA to 6 microA) to tune the electric field.

Related Experiment Videos

  • One-dimensional potential model calculations.

    • Main Results:

    • A significant Stark effect was observed, causing a shift in the surface-state binding energy (E0).
    • Experimental data were accurately reproduced by the 1D potential model.
    • The derived Stark-free energy (E0) aligns with state-of-the-art photoemission spectroscopy measurements.

    Conclusions:

    • The electric field in the tunnel junction significantly impacts the Ag(111) surface state binding energy.
    • The observed Stark effect can be quantitatively modeled.
    • This study validates STS as a method for precise surface electronic structure determination.