| Issue |
Europhys. Lett.
Volume 70, Number 3, May 2005
|
|
|---|---|---|
| Page(s) | 362 - 368 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10008-4 | |
| Published online | 06 April 2005 | |
Boundary effect on CDW: Friedel oscillations, STM image
Department of Physics, Budapest University of Technology and Economics H-1521 Budapest, Hungary
Received:
19
January
2005
Accepted:
17
March
2005
We study the effect of open boundary condition on charge density
waves (CDW). The electron density oscillates rapidly close to the
boundary, and additional non-oscillating terms (
)
appear. The Friedel oscillations survive beyond the CDW coherence
length (
), but their amplitude gets heavily
suppressed. The scanning tunneling microscopy image (STM) of CDW
shows clear features of the boundary. The local tunneling
conductance becomes asymmetric with respect to the Fermi energy,
and considerable amount of spectral weight is transferred to the
lower gap edge. Also it exhibits additional zeros reflecting the
influence of the boundary.
PACS: 71.45.Lr – Charge-density-wave systems / 68.37.Ef – Scanning tunneling microscopy (including chemistry induced with STM) / 73.40.Gk – Tunneling
© EDP Sciences, 2005
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