### Session D20: Focus Session: Growth and Properties of Novel Semiconductor and Related Nanostructures

2:30 PM–5:30 PM, Monday, March 10, 2008
Morial Convention Center Room: 212

Chair: Ray Phaneuf, University of Maryland

Abstract ID: BAPS.2008.MAR.D20.9

### Abstract: D20.00009 : Phase transition induced surface electronic states on Pb/Si(111) surface

4:30 PM–4:42 PM

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#### Authors:

Hsing-Yi Chou
(Insitute of Physics, Academia Sinica, 115 Nankang, Taipei, Taiwan)

Wei-Bin Su
(Insitute of Physics, Academia Sinica, 115 Nankang, Taipei, Taiwan)

Chi-Lun Jiang
(Insitute of Physics, Academia Sinica, 115 Nankang, Taipei, Taiwan)

Ming-Chi Yang
(Insitute of Physics, Academia Sinica, 115 Nankang, Taipei, Taiwan)

Chun-Liang Lin
(Insitute of Physics, Academia Sinica, 115 Nankang, Taipei, Taiwan)

Chia-seng Chang
(Insitute of Physics, Academia Sinica, 115 Nankang, Taipei, Taiwan)

Tien-Tzou Tsong
(Insitute of Physics, Academia Sinica, 115 Nankang, Taipei, Taiwan)

It is known that the 1$\times$1 phase of a monolayer Pb on Si(111) surface at room temperature may undergo a phase transition into a $\surd$7x$\surd$3 phase at a low temperature below 250K. We use scanning tunneling spectroscopy to study electronic structures on both 1$\times$1 and $\surd$7x$\surd$3 phases. Our observation reveals that the electronic structures of Pb overlayer are significantly affected because of phase transition. In tunneling spectra there appears two distinct peaks on $\surd$7x$\surd$3 phase but they disappear on 1$\times$1 phase, indicating that the phase transition can induce the formation of the surface electronic states on $\surd$7x$\surd$3 phase. Moreover, the peak intensity is location-dependent and the relative strength at the low-energy peak can be reversed at the high-energy peak. These phenomena can be qualitatively explained by Kronig-Penney model.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.D20.9