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Intertwined electronic and structural phase transitions in the In/Si(111) interface.

Jiandong Guo1, Geunseop Lee, E W Plummer

  • 1Department of Physics and Astronomy, The University of Tennessee, Knoxville, 37996, USA.

Physical Review Letters
|August 11, 2005
PubMed
Summary

The In/Si interface shows gradual structural and electronic transitions, creating complex coexisting domains. Atomic-level study visualizes interactions between metallic and semimetallic phases.

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Area of Science:

  • Surface science
  • Condensed matter physics
  • Materials science

Background:

  • The In/Si interface exhibits complex structural and electronic properties.
  • Understanding phase transitions at interfaces is crucial for materials science.

Purpose of the Study:

  • To investigate the structural (4 x 1) to (8 x 2) and electronic metal-to-semimetal transitions at the In/Si interface.
  • To elucidate the coexistence and interaction of different phases during these transitions at the atomic level.

Main Methods:

  • Scanning tunneling microscopy (STM) for atomic-scale imaging.
  • Scanning tunneling spectroscopy (STS) for electronic property analysis.

Main Results:

  • Both structural and electronic transitions are gradual, not abrupt.
  • A complex domain structure emerges in the transition temperature range.
  • Metallic (4 x 1) and semimetallic (8 x 2) domains coexist with novel nanophases.
  • Direct visualization of intertwined phase interactions at the atomic scale.

Conclusions:

  • The In/Si interface displays a complex interplay between structural and electronic transitions.
  • Gradual transitions lead to a heterogeneous domain structure with coexisting phases.
  • Atomic-level probing provides direct insight into interfacial phase dynamics.