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Classical and quantum chaotic angular-momentum pumps.

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  • 1Departamento de Física, Universidad Nacional de Colombia, and CeiBA-Complejidad, Bogotá D.C., Colombia.

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Summary
This summary is machine-generated.

This study demonstrates generating polarized currents and spin pumping via asymmetric spin-orbit coupling and kicked magnetic fields. These effects are explained by Floquet theory and confirmed with numerical simulations.

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Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Spintronics

Background:

  • Periodically driven systems exhibit complex dynamics.
  • Spin-orbit coupling is crucial for spintronic applications.
  • Generating polarized currents and spin pumping are key challenges.

Purpose of the Study:

  • To investigate directed transport of charge and angular momentum.
  • To explore spin separation using asymmetric spin-orbit coupling.
  • To theoretically and numerically confirm spin pumping phenomena.

Main Methods:

  • Utilizing the Floquet formalism for theoretical analysis.
  • Employing numerical solutions of the time-dependent Schrödinger equation.
  • Simulating scattering with a kicked magnetic field and spin-orbit coupling.

Main Results:

  • Achieved directed transport of charge and intrinsic angular momentum.
  • Generated polarized currents through spatially asymmetric spin flips.
  • Demonstrated spin pumping effects at the quantum level.

Conclusions:

  • Fast and strong driving regimes enable efficient spin separation.
  • Floquet theory accurately describes the observed spin pumping.
  • Numerical simulations validate the theoretical predictions.