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Quantum interference in artificial band structures.

R A Deutschmann1, W Wegscheider, M Rother

  • 1Walter Schottky Institut, Technische Universität München, 85748 Garching, Germany.

Physical Review Letters
|April 6, 2001
PubMed
Summary
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Magnetotransport experiments show quantum interference oscillations in two-dimensional electron systems. These oscillations arise from electron self-interference and enhanced backscattering, including known commensurability effects.

Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • Two-dimensional electron systems (2DES) exhibit unique electronic properties.
  • Artificial potentials can precisely tailor the electronic band structure of 2DES.
  • Understanding quantum interference phenomena is crucial for novel electronic devices.

Purpose of the Study:

  • To investigate quantum interference oscillations in 2DES with one-dimensional potential modulation.
  • To elucidate the mechanisms behind observed oscillations using a semiclassical framework.
  • To explore the role of magnetic breakdown and backscattering in these phenomena.

Main Methods:

  • Magnetotransport experiments were conducted on 2DES.
  • Atomically precise, one-dimensional potential modulation was applied.

Related Experiment Videos

  • Semiclassical analysis was used to interpret the experimental results.

    • Main Results:

    • Striking quantum interference oscillations were observed.
    • Oscillations were attributed to self-interference along closed orbits and interference-enhanced backscattering.
    • Magnetic breakdown between Fermi contour segments was identified as a key factor enabling closed orbits.
    • Commensurability oscillations were recognized as a specific instance of enhanced backscattering.

    Conclusions:

    • The study reveals complex quantum interference effects in modulated 2DES.
    • Semiclassical models successfully explain the observed oscillations, including magnetic breakdown and backscattering.
    • Findings provide insights into the control of electron transport in artificial band structures.