Boundary effect on CDW: Friedel oscillations, STM image

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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 (vF/Δ), 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.

Original languageEnglish
Pages (from-to)362-368
Number of pages7
JournalEurophysics Letters
Issue number3
Publication statusPublished - May 1 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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