Boundary effect on CDW: Friedel oscillations, STM image

Details Boundary effect on CDW: Friedel oscillations, STM image Boundary effect on CDW: Friedel oscillations, STM image

2005-03-17

arxiv.org/abs/cond-mat/0503435v1

Europhys. Lett. 70, 362 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 6 figures

Scientific paper

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 (~ln(r)) appear. The Friedel oscillations survive beyond the CDW coherence length (v_F/Delta), 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.

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