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Related Concept Videos

The Hall Effect01:30

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Strained graphene Hall bar.

S P Milovanović1, F M Peeters

  • 1Departement Fysica, Universiteit Antwerpen Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.

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|December 24, 2016
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Summary
This summary is machine-generated.

Strain in graphene Hall bars significantly alters electron transport. A Gaussian bump reduces bend resistance near zero magnetic field and creates side-peaks, aiding in bump size estimation.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene's unique electronic properties make it a candidate for advanced electronic devices.
  • Understanding strain effects is crucial for reliable graphene-based device performance.
  • Hall bar geometry is standard for probing transport phenomena.

Purpose of the Study:

  • Investigate strain effects on magnetic transport in graphene Hall bars.
  • Analyze how a Gaussian bump influences bend and Hall resistance.
  • Compare classical and quantum mechanical transport theories for strain effects.

Main Methods:

  • Numerical simulations using classical and quantum mechanical transport theories.
  • Modeling a Gaussian bump to induce strain in a graphene Hall bar.
  • Analyzing magnetic field dependent transport properties, specifically bend resistance (R_B).

Main Results:

  • A decrease in R_B around zero magnetic field and occurrence of side-peaks due to bump-assisted scattering.
  • Quantum simulations reveal additional R_B oscillations from Landau level dynamics.
  • Hall resistance shows minimal influence from the bump, even under high pseudo-magnetic fields.

Conclusions:

  • Strain-induced features in bend resistance can estimate Gaussian bump size.
  • Quantum effects like Landau level population lead to observable oscillations.
  • Controlled bump placement can enable collection of valley-polarized electrons.