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Nonlinear transport in non-centrosymmetric systems.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Electronics

Background:

  • Ohm's law describes the linear relationship between voltage and current in conductive systems.
  • This linear relationship persists even with broken time-reversal symmetry (e.g., magnetoresistance, Hall effect).
  • Recent findings indicate a breakdown of Ohm's law in specific non-centrosymmetric structures.

Purpose of the Study:

  • To review demonstrations of nonlinear transport in non-centrosymmetric systems.
  • To analyze the relationship between nonlinear behavior and system symmetry.
  • To investigate the microscopic mechanisms underlying these nonlinear effects.

Main Methods:

  • Review of experimental demonstrations of nonlinear transport.
  • Analysis of symmetry properties in non-centrosymmetric systems.
  • Investigation of microscopic mechanisms like Berry curvature dipole and Berry connection polarizability.

Main Results:

  • Nonlinear transport effects, exhibiting quadratic scaling between voltage and current, are observed in non-centrosymmetric systems.
  • A direct link is established between nonlinear transport phenomena and the symmetry of the material.
  • Microscopic origins such as Berry curvature dipole and Berry connection polarizability are identified as key drivers.

Conclusions:

  • Ohm's law is not universally applicable, with nonlinear transport emerging in systems lacking inversion symmetry.
  • Understanding material symmetry is crucial for predicting and controlling nonlinear transport.
  • Nonlinear transport phenomena offer promising avenues for applications in spintronics and energy harvesting.