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Sn/Ge(111) surface charge-density-wave phase transition

Kidd1, Miller, Chou

  • 1Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080 and and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwi.

Physical Review Letters
|October 13, 2000
PubMed
Summary
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Surface electronic structure of tin on germanium(111) reveals a gap opening in the low-temperature phase. This unusual Peierls-like transition is driven by surface defects, not Fermi nesting.

Area of Science:

  • Surface Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • The surface electronic structure of tin (Sn) on germanium (Ge)(111) exhibits distinct phases.
  • Understanding these phases is crucial for developing novel electronic materials.

Purpose of the Study:

  • To investigate the surface electronic structure of 1/3 monolayer Sn on Ge(111) in its room-temperature and low-temperature phases.
  • To elucidate the mechanism behind the observed electronic behavior, particularly the gap opening.

Main Methods:

  • Angle-resolved photoemission spectroscopy (ARPES) was employed to probe the electronic states.
  • Theoretical calculations were performed to understand the symmetry and electronic response.

Main Results:

Related Experiment Videos

  • A significant electronic band gap opens around the (3x3) Brillouin zone boundary in the low-temperature phase.
  • This gap formation suggests a Peierls-like transition, occurring despite the absence of Fermi surface nesting.
  • The electronic behavior is highly sensitive to doping from intrinsic surface defects.

Conclusions:

  • Intrinsic surface defects play a critical role in driving the Peierls-like transition and the observed (3x3) symmetry.
  • The findings challenge conventional understanding of Peierls transitions in similar systems.