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Nonlinear Hall effect in Rashba systems with hexagonal warping.

Soumadeep Saha1, Awadhesh Narayan2

  • 1Undergraduate Programme, Indian Institute of Science, Bangalore 560012, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 18, 2023
PubMed
Summary
This summary is machine-generated.

Researchers explored non-linear Hall effects in Rashba spin-orbit coupled systems with hexagonal warping. They discovered unique dipole profiles and predicted a third-order Hall effect, offering new avenues for material engineering.

Keywords:
Berry curvatureBerry curvature dipoleRashba spin-orbithexagonal warpingnon-linear hall effect

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Rashba spin-orbit coupled systems exhibit diverse phenomena.
  • Non-linear Hall effects have been observed in materials lacking inversion symmetry.

Purpose of the Study:

  • Investigate second- and third-order Hall response in Rashba systems with hexagonal warping.
  • Explore Berry curvature multipole physics and engineer non-linear Hall effects.

Main Methods:

  • Utilized a low-energy model to derive analytic expressions for Hall response.
  • Employed a realistic tight-binding model for extended analysis.
  • Analytically calculated the Berry connection polarizability tensor.

Main Results:

  • Discovered a unique dipole profile in Rashba systems with hexagonal warping.
  • Predicted the existence of a third-order Hall effect.
  • Identified the influence of model parameters on third-order conductivity.

Conclusions:

  • The findings facilitate experimental realization of Berry curvature multipole physics in specific Rashba materials.
  • This work provides a novel platform for engineering non-linear Hall effects.