| Issue |
Europhys. Lett.
Volume 39, Number 1, July I 1997
|
|
|---|---|---|
| Page(s) | 67 - 72 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00315-2 | |
| Published online | 01 December 2003 | |
Observation of interfering Bloch waves
1
Fritz-Haber-Institut der
Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195
Berlin, Germany
2
Department of Physics and Astronomy,
University of Tennessee, Knoxville, TN 37996, USA
Oak Ridge National Laboratories - Oak Ridge, TN
37831-6057, USA
Received:
4
March
1997
Accepted:
26
May
1997
We have observed
anisotropic standing waves on the Be(10
0 surface using a low-temperature scanning tunnelling
microscope (STM). Such charge density oscillations result from interference of electronic
states near scattering centers. Since the charge density on Be(100
is mainly provided by a surface state located near the edge of
the first Brillouin zone, the wave functions are significantly
different from plane waves. It is shown how this difference is
reflected in the STM images. By numerical post-processing we find
that the observed wave patterns exhibit a multiperiodic
structure with individual periods differing by inverse lattice
vectors. This result constitutes a direct experimental
illustration of the Bloch theorem for electrons in a periodic
potential.
PACS: 73.20.At – Surface states, band structure, electron density of states / 72.10.Fk – Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect)
© EDP Sciences, 1997
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