Novel electronic wave interference patterns in nanographene sheets

Details Novel electronic wave interference patterns in nanographene sheets Novel electronic wave interference patterns in nanographene sheets

2002-08-16

arxiv.org/abs/cond-mat/0208323v3

J. Phys.: Condens. Matter 14 (16 Septemeber 2002) L605-L611

Physics

Condensed Matter

Materials Science

Published as a LETTER in J. Phys.: Condens. Matter; 8 pages; 6 figures; Online version at http://www.iop.org/EJ/S/3/1256/0hJ

Scientific paper

10.1088/0953-8984/14/36/102

Superperiodic patterns with a long distance in a nanographene sheet observed by STM are discussed in terms of the interference of electronic wave functions. The period and the amplitude of the oscillations decrease spatially in one direction. We explain the superperiodic patterns with a static linear potential theoretically. In the k-p model, the oscillation period decreases, and agrees with experiments. The spatial difference of the static potential is estimated as 1.3 eV for 200 nm in distance, and this value seems to be reasonable in order that the potential difference remains against perturbations, for example, by phonon fluctuations and impurity scatterings. It turns out that the long-distance oscillations come from the band structure of the two-dimensional graphene sheet.

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