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The Nernst effect in Corbino geometry.

A V Kavokin1, B L Altshuler1,2, S G Sharapov3

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Proceedings of the National Academy of Sciences of the United States of America
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PubMed
Summary
This summary is machine-generated.

This study reveals unique Nernst effect oscillations in Corbino disks, enabling direct measurement of magnetization currents. Different carrier types, like Dirac fermions, show distinct oscillation patterns.

Keywords:
Corbino diskNernst effectmagnetic oscillations

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Area of Science:

  • Condensed Matter Physics
  • Thermodynamics
  • Materials Science

Background:

  • The Nernst effect is crucial for understanding thermoelectric phenomena.
  • Conventional geometries mask magnetization currents, complicating analysis.
  • Corbino disk geometry allows direct measurement of these currents.

Purpose of the Study:

  • To investigate the Nernst effect in a Corbino disk under magnetic and temperature gradients.
  • To directly measure magnetization (edge) currents, independent of sample conductivity.
  • To differentiate Nernst signal characteristics for Dirac fermions versus 2D electrons with parabolic spectra.

Main Methods:

  • Utilizing Corbino disk geometry for direct edge current measurement.
  • Applying a normal external magnetic field and radial temperature gradient.
  • Analyzing magnetic field oscillations at the disk's center as a function of the external field.

Main Results:

  • Observed strong oscillations in the central magnetic field, directly manifesting the thermodynamic Nernst effect.
  • Oscillation characteristics depend on the temperature difference across the disk.
  • Distinct oscillation phases and frequencies were identified for Dirac fermions and parabolic 2D electrons.

Conclusions:

  • The Corbino disk provides a unique platform for studying thermodynamic Nernst effects.
  • Predicts different power-law dependencies of the Nernst signal on chemical potential for distinct carrier types.
  • Highlights the potential for characterizing electronic systems through Nernst effect measurements.