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Related Experiment Videos

Integer quantum Hall effect on a six-valley hydrogen-passivated silicon (111) surface.

K Eng1, R N McFarland, B E Kane

  • 1Laboratory for Physical Sciences, University of Maryland at College Park, College Park, Maryland 20740, USA.

Physical Review Letters
|August 7, 2007
PubMed
Summary
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Magnetotransport studies reveal broken valley degeneracy in a two-dimensional electron system on hydrogen-passivated Si(111). This leads to unequal valley occupation and resistance anisotropy, challenging noninteracting electron theories.

Area of Science:

  • Condensed matter physics
  • Surface science
  • Materials science

Background:

  • Two-dimensional electron systems (2DES) are crucial for understanding quantum phenomena.
  • The Si(111) surface offers a unique platform for creating 2DES at the interface with vacuum.
  • Valley degeneracy in such systems is typically expected to be sixfold.

Purpose of the Study:

  • Investigate magnetotransport properties of a 2DES at a hydrogen-passivated Si(111)-vacuum interface.
  • Determine the valley occupation and its effect on electronic properties.
  • Explore the implications for theoretical models of quantum Hall effects.

Main Methods:

  • Magnetotransport measurements were performed.
  • Studies were conducted in the integer quantum Hall regime.

Related Experiment Videos

  • The two-dimensional electron system was formed in an inversion layer.

    • Main Results:

    • The expected sixfold valley degeneracy was found to be broken.
    • Unequal occupation of the six valleys was observed.
    • Anisotropy in electrical resistance was detected, correlating with valley occupation.

    Conclusions:

    • Surface misorientation likely breaks valley states into unequally spaced pairs.
    • Observed odd filling factors present a challenge to noninteracting electron theories.
    • Further theoretical and experimental investigation is needed to fully explain the findings.