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Phys. Rev. B 67, 205416 (2003) [5 pages]

STM observations of a one-dimensional electronic edge state at steps on Cu(111)

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Ludwig Bartels
University of California at Riverside, Riverside, California, 92521

S. W. Hla
Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701

A. Kühnle*, G. Meyer†, and K.-H. Rieder
Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

J. R. Manson
Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634

Received 9 September 2002; revised 2 January 2003; published 23 May 2003

Scanning tunneling microscopy measurements across isolated straight step edges on a Cu(111) surface were carried out for biases between 100 mV and 5 V. In addition to the well known surface state oscillations, and at lower sample bias than the onset of the two-dimensional surface image state, a sharply defined linear protrusion, was observed at the top of the step faces. This linear feature is interpreted as a one-dimensional image state at the step, with its energy modified by a dipolar potential whose appearance is attributed to Smoluchowski smoothing of the electron density at the step edge.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.205416
DOI:
10.1103/PhysRevB.67.205416
PACS:
73.20.-r, 73.61.-r

*Present address: Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus, Denmark.

†Present address: IBM Zurich Research Laboratories, 8803 Rüschlikon-ZH, Switzerland.

 
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