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Scanning gate imaging of a disordered quantum point contact.

N Aoki1, C R da Cunha, R Akis

  • 1Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.

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Scanning Gate Microscopy (SGM) images electron flow in mesoscopic structures. SGM revealed unique conductance fluctuations and quantum effects in an InGaAs quantum well, offering insights into electron transport.

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Area of Science:

  • Condensed Matter Physics
  • Mesoscopic Physics
  • Quantum Transport

Background:

  • Scanning Gate Microscopy (SGM) is a technique for imaging electron flow in mesoscopic systems.
  • Disorder in mesoscopic structures can lead to unique electron transport properties.
  • InGaAs quantum wells exhibit quasi-ballistic transport regimes.

Purpose of the Study:

  • To investigate electron transport properties in an InGaAs quantum well using SGM.
  • To analyze conductance fluctuations and quantum phenomena in a fabricated quantum point contact.
  • To visualize and quantify features related to coherent electron flow.

Main Methods:

  • Fabrication of a quantum point contact on an InGaAs quantum well heterostructure.
  • Application of Scanning Gate Microscopy (SGM) to image electron transport.
  • Analysis of interference patterns and resistance peaks at zero and high magnetic fields.

Main Results:

  • SGM revealed interference patterns linked to conductance fluctuations in the InGaAs system.
  • Mode-dependent resistance peaks corresponding to quantum conductance levels (2e^2/h) were observed at zero magnetic field.
  • Integer quantum Hall effect plateaus were observed at high magnetic fields, allowing estimation of edge channel sizes.

Conclusions:

  • SGM is effective in visualizing complex electron transport phenomena in mesoscopic systems.
  • The study highlights unexpected conductance fluctuations in InGaAs quantum wells.
  • SGM provides a method to estimate the physical dimensions of incompressible edge channels.