Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00161 : Scanning Tunneling Spectroscopy Observation of New Type of Resonances on the Dense Pb Overlayer on the Si(111)
Author:
We use scanning tunneling spectroscopy (STS) to investigate the
electronic structures of the dense Pb overlayers of 1$\times $1,
$\surd $7$\times \surd $3 and stripe incommensurate (SIC) phases
grown on the Si(111) surface. Although their atomic structures
are all very different, very surprisingly the STS spectra of
these three phases show a nearly identical oscillatory feature
with two resonance peaks. These resonances are not the common
quantum-well states but the energy bands originating from the
dominant 1$\times $1 potential in these phases. However, the
local electronic states found by STS on the $\surd $7$\times
\surd $3 and SIC phase exhibit that the resonances can be
affected locally by the superstructures of two phases. It
reflects that there exists a weak additional one-dimensional
periodic potential on the $\surd $7$\times \surd $3 phase and the
SIC phase is of the local variation of the work function.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.161
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