High-resolution core-level photoemission study of dense Pb overlayers on Si(111)

Won Hoon Choi, Keun Su Kim, Han Woong Yeom

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Structure and bonding configuration of dense Pb overlayers on the Si(111) surface have been studied by low-energy-electron diffraction and high-resolution photoelectron spectroscopy using synchrotron radiation. Several representative phases in its devil's staircase phase diagram have been systematically investigated by varying the Pb coverage at 200-300 K. Pb5d photoelectron spectra indicate that there exist two distinct bonding configurations of Pb, which are interpreted as the hollow and on-top (T1) sites of the structure models proposed earlier. In case of surface Si atoms, mainly two different bonding environments are revealed by surface Si2p components for the low-density √7 x √3 phase. These can be assigned to T1 and modified on-top (T1′) sites surrounding hollow-site adatoms. As the coverage increases, the minority site T1 converts to T1′ making the topmost Si layer have a unique bonding configuration. This behavior is also consistent with the structure models. The temperature-dependent study reveals that the √7 x √3 phase undergoes a reversible phase transition into a 1 x 1 phase. This phase transition induces no significant change in Pb core levels but a marginal increase in the Si2p component for the T1′ sites. We suggest a plausible scenario of the phase transition based on the structure model with 1.2 monolayer Pb and the active diffusion of hollow-site adatoms.

Original languageEnglish
Article number195425
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number19
DOIs
Publication statusPublished - 2008 Nov 24

Fingerprint

Core levels
Photoemission
photoelectric emission
Model structures
hollow
Adatoms
Phase transitions
high resolution
adatoms
configurations
Low energy electron diffraction
stairways
minorities
Photoelectron spectroscopy
Photoelectrons
Synchrotron radiation
Phase diagrams
Monolayers
synchrotron radiation
photoelectrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "High-resolution core-level photoemission study of dense Pb overlayers on Si(111)",
abstract = "Structure and bonding configuration of dense Pb overlayers on the Si(111) surface have been studied by low-energy-electron diffraction and high-resolution photoelectron spectroscopy using synchrotron radiation. Several representative phases in its devil's staircase phase diagram have been systematically investigated by varying the Pb coverage at 200-300 K. Pb5d photoelectron spectra indicate that there exist two distinct bonding configurations of Pb, which are interpreted as the hollow and on-top (T1) sites of the structure models proposed earlier. In case of surface Si atoms, mainly two different bonding environments are revealed by surface Si2p components for the low-density √7 x √3 phase. These can be assigned to T1 and modified on-top (T1′) sites surrounding hollow-site adatoms. As the coverage increases, the minority site T1 converts to T1′ making the topmost Si layer have a unique bonding configuration. This behavior is also consistent with the structure models. The temperature-dependent study reveals that the √7 x √3 phase undergoes a reversible phase transition into a 1 x 1 phase. This phase transition induces no significant change in Pb core levels but a marginal increase in the Si2p component for the T1′ sites. We suggest a plausible scenario of the phase transition based on the structure model with 1.2 monolayer Pb and the active diffusion of hollow-site adatoms.",
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High-resolution core-level photoemission study of dense Pb overlayers on Si(111). / Choi, Won Hoon; Kim, Keun Su; Yeom, Han Woong.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 78, No. 19, 195425, 24.11.2008.

Research output: Contribution to journalArticle

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