Jun, 2009
Modification of surface electronic properties on alloy surfaces: Standing waves on a Cu-9 at. % Al(111) surface observed by STM
PHYSICAL REVIEW B
- ,
- ,
- Volume
- 79
- Number
- 23
- First page
- 235427-1
- Last page
- 235427-4
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1103/PhysRevB.79.235427
- Publisher
- AMER PHYSICAL SOC
A direct and real-space study of the surface electronic structure on Cu-9 at. % Al(111) alloy surfaces was performed using low-temperature scanning tunneling microscopy. The standing waves on Cu-9 at. % Al(111)-(1X1) and (root 3X root 3)R30 degrees surfaces, which were obtained by controlling annealing temperature, were observed by differential-conductance mapping. Surface imperfection caused by segregation of aluminum atoms acted as static scattering centers in order to sustain the standing-wave formation. An analysis of the standing waves revealed a significant downward energy shift of the Shockley surface states on both surfaces. This shift is explained in terms of the strong redistribution of the surface electrons.
- Link information
- ID information
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- DOI : 10.1103/PhysRevB.79.235427
- ISSN : 1098-0121
- Web of Science ID : WOS:000267699500134