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Angle-resolved photoemission from surface states.

E E Krasovskii1, W Schattke

  • 1Institut für Theoretische Physik, Christian-Albrechts-Universität, Leibnizstrasse 15, D-24098 Kiel, Germany.

Physical Review Letters
|August 25, 2004
PubMed
Summary
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The evanescent part of unoccupied complex band structure influences photoemission from surface states. This study explains emission intensity and offers a new method to monitor surface properties using photoemission spectroscopy.

Area of Science:

  • Solid State Physics
  • Surface Science
  • Quantum Mechanics

Background:

  • Surface states are crucial for understanding material properties.
  • Photoemission spectroscopy is a key technique for probing electronic structure.
  • The role of evanescent states in photoemission is not fully understood.

Purpose of the Study:

  • To reveal the role of the evanescent part of the unoccupied complex band structure in photoemission from surface states.
  • To explain the frequency dependence of emission intensity from Al surfaces.
  • To present a novel method for determining surface states.

Main Methods:

  • Ab initio one-step theory of photoemission.
  • Calculation of unoccupied complex band structure.

Related Experiment Videos

  • Development of a novel embedding method for surface states.

    • Main Results:

    • The evanescent part of the unoccupied complex band structure significantly influences photoemission from surface states.
    • The frequency dependence of emission intensity from Al(100) and Al(111) surfaces was successfully explained.
    • A high sensitivity of surface states spectra to the surface potential barrier was predicted.

    Conclusions:

    • The evanescent states play a key role in photoemission.
    • The developed theory accurately describes experimental observations.
    • The predicted sensitivity offers a new pathway for surface characterization.