APS » PROLA » Phys. Rev. Lett. » Volume 79 » Issue 2

Phys. Rev. Lett. 79, 265 - 268 (1997)

Anisotropic Two-Dimensional Friedel Oscillations

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Ph. Hofmann1, B. G. Briner2, M. Doering2, H.-P. Rust2, E. W. Plummer1, and A. M. Bradshaw2
1Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996 and Oak Ridge National Laboratories, Oak Ridge, Tennessee 37831-6057
2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

Received 13 December 1996

Scanning tunneling microscopy at 4 K shows highly anisotropic screening charge density oscillations on Be(101̅ 0) in the vicinity of surface defects and steps. The forms of these oscillations, which derive from the Friedel oscillations, can be directly related to the two-dimensional band structure of the surface (two electron pockets at the boundary of the surface Brillouin zone). Simple calculations show that the Friedel oscillations in such a case will contain major contributions from wavelengths which do not correspond to any Fermi wave vector.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v79/p265
DOI: 10.1103/PhysRevLett.79.265
PACS: 73.20.At, 71.18.+y, 71.20.Dg, 72.10.Fk

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