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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 22, Number 5
BKCSDE 22(5)
May 20, 2001 

 
Title
How are the Lower Lying Atoms Imaged Brighter than the Higher Lying Ones in the STM Experiments?
Author
Dongwoon Jung
Keywords
Transition metal dichalcogenides, STM, AFM, Electron density, Fermi energy.
Abstract
Unexpectedly, the brightest row was known to represents the lowest lying Te atoms in the STM image of NbTe2. Projected density of states and crystal orbital overlap population show that the 5pz orbital of the lowest lying Te(2) atom does not interact with the 4d orbital of Nb strongly so that the 5pz band remains in the vicinity of the Fermi energy. Consequently the lowest lying Te(2) atoms contribute higher electron density near the Fermi energy which in turn exhibits brightest image in the STM experiments.
Page
499 - 502
Full Text
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