Open AccessA STUDY ON THE LOCAL ELECTRONIC STRUCTURE OF GRAPHITE SURFACE WITH SCANNING TUNNELING SPECTROSCOPY (STS)
Author(s) -
LI Nan,
钱生法,
傅春生,
解思深
Publication year - 1994
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.43.274
Subject(s) - local density of states , graphite , scanning tunneling spectroscopy , materials science , fermi level , spectral line , density of states , scanning tunneling microscope , crystal (programming language) , electronic structure , spectroscopy , atomic physics , band gap , electronic band structure , condensed matter physics , physics , molecular physics , electron , quantum mechanics , astronomy , computer science , composite material , programming language
By using STS, combined with STM imaging, the STS spectra d(lnI)/d(lnV) -eV were measured point by point along a line on the surface of a single crystal graphite. The local density of states (LDOS) around the Fermi level EF obtained from the spectra showed basically an agreement with that of theoretical calculation. By plotting the energy positions of the LDOS peaks around EF with respect to the measurement positions, the spatial variations of the energy band of graphite close to EF were shown. With a discussion of the local electronic structure around the ine-quivalent A, B type atoms on the surface, a simple model calculation for the spatial variations of the energy band was conducted and that showed an agreement with the experimental results. By comparison of the results, the site of A type atoms on the graphite surface, which did not appear in the STM image, was determined.