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Localization of the Cu111 surface state by single Cu adatoms
F E Olsson1, M Persson, A G Borisov
1Department of Applied Physics, Chalmers/Göteborg University, S-41296 Göteborg, Sweden.
Physical Review Letters
|December 17, 2004
Summary
Copper adatoms localize the 2D Shockley surface state on Cu(111) surfaces, creating a resonance below the band edge. This localization, explained by bound state theory, also reveals adatom-induced atomic orbital resonances.
Area of Science:
- Surface Science
- Condensed Matter Physics
- Materials Science
Background:
- The Cu(111) surface exhibits a two-dimensional Shockley surface state.
- Understanding surface states is crucial for catalysis and electronic devices.
- Adatom interactions can significantly modify surface electronic properties.
Purpose of the Study:
- To investigate the localization of the Shockley surface state induced by copper adatoms on the Cu(111) surface.
- To characterize the resulting resonance states and their origins.
- To provide a theoretical framework for understanding adatom-induced surface state modifications.
Main Methods:
- Experimental scanning tunneling microscopy (STM) spectroscopy.
- Simulated STM spectroscopy.
- Theoretical analysis based on the existence theorem for bound states.
Main Results:
- Identified the localization of the 2D Shockley surface state induced by Cu adatoms on Cu(111).
- Observed a resonance state just below the surface state band edge.
- Detected adatom-induced resonance states originating from atomic orbitals in both experimental and simulated spectra.
Conclusions:
- Cu adatoms induce localization of the Shockley surface state on Cu(111).
- The observed localization can be explained by the theory of bound states in attractive potentials.
- Adatom-induced atomic orbital resonances are a key feature of these interactions.