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Time-Reversal-Even Nonlinear Current Induced Spin Polarization.

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We discovered a new way to generate spin in materials using electric fields, leading to novel nonlinear spin-orbit torque. This effect, originating from quantum mechanics, is observable in various magnetic and nonmagnetic systems.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Current-induced spin polarization is crucial for spintronics.
  • Nonlinear effects in materials are gaining research interest.

Purpose of the Study:

  • To propose and investigate a novel time-reversal-even spin generation mechanism.
  • To explore its application in nonlinear spin-orbit torque.
  • To understand the quantum origin of this spin generation.

Main Methods:

  • Theoretical proposal of time-reversal-even spin generation.
  • Analysis of quantum origin via momentum space dipole of anomalous spin polarizability.
  • First-principles calculations for material predictions.

Main Results:

  • Demonstrated spin generation in second order of electric fields.
  • Identified this as the dominant mechanism for current-induced spin polarization in centrosymmetric nonmagnetic materials.
  • Predicted sizable spin generation in hcp metals, monolayer TiTe2, and monolayer MnSe2.

Conclusions:

  • The proposed mechanism offers a new route for nonlinear spintronics.
  • This effect can be harnessed in both nonmagnetic and magnetic materials.
  • Experimental detection of predicted spin generations is feasible.