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Laterally modulated 2D electron system in the extreme quantum limit.

S Melinte1, Mona Berciu, Chenggang Zhou

  • 1Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.

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We observed complex resistivity fluctuations in a two-dimensional electron system (2DES) under a modulated surface superlattice. Disorder

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Two-dimensional electron systems (2DES) are crucial for understanding quantum phenomena.
  • Surface superlattices introduce periodic potential modulations affecting electron behavior.

Purpose of the Study:

  • To investigate magnetotransport properties of a 2DES with a surface superlattice gate.
  • To analyze the influence of periodic modulation on resistivity fluctuations.

Main Methods:

  • Fabrication of a 2DES with a surface superlattice gate structure.
  • Measurement of magnetotransport, specifically diagonal resistivity, at low Landau level fillings.
  • Theoretical modeling considering disorder and periodic modulation effects.

Main Results:

  • Observed a rich pattern of diagonal resistivity fluctuations in the 2DES.
  • Disorder effects were found to dominate over the periodic modulation.
  • Fluctuations occurred at low Landau level fillings (nu).

Conclusions:

  • Theoretical arguments qualitatively explain the observed magnetotransport data.
  • The interplay between strong disorder and weak periodic modulation governs the system's behavior.