Threshold Phenomena in Nonlinear Currents Upon Metallization of Si(001)

Abstract

Using a novel combination of fundamental and harmonic polarizations, we have used optical second harmonic (SH) generation to probe the nonlinear currents induced parallel to the surface plane of a Si(001) crystal upon adsorption of Na, K, and Cs. For all three alkalis, we observed abrupt thresholds in SH intensity and relative SH phase shift at the same coverage of very nearly one-sixth of a monolayer. We speculate that these thresholds correspond to insulator-metal transitions, and that a recently-observed low-coverage (2x3) structure is a Mott-Hubbard-like insulator.

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Document Details

Document Type
Technical Report
Publication Date
May 26, 1992
Accession Number
ADA252255

Entities

People

  • Geraldine L. Richmond
  • S. Arekat
  • Stephen Douglas Kevan

Organizations

  • University of Oregon

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Auger Electron Spectroscopy
  • Auger Electrons
  • Charge Carriers
  • Charge Density
  • Chemistry
  • Classification
  • Electron Spectroscopy
  • Electrons
  • Elements
  • Measurement
  • Metal-Insulator Transitions
  • Military Research
  • Monitoring
  • Resonance
  • Resonant Frequency
  • Universities
  • Work Functions

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Electrochemical Engineering/ Fuel Cell Technologies
  • Semiconductor Device Technology

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene