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Floquet-Engineered Valleytronics in Dirac Systems.

Arijit Kundu1, H A Fertig1, Babak Seradjeh1

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Summary
This summary is machine-generated.

We demonstrate optical control of valley degrees of freedom in 2D Dirac materials using intense light. This enables the creation of valley-polarized currents and an optically controlled valley valve, robust against disorder.

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • Valley degrees of freedom in 2D Dirac materials are a promising resource for quantum information processing.
  • Effective control over these valley states is crucial for harnessing their potential.
  • Existing methods for valley control often lack optical tunability or robustness.

Purpose of the Study:

  • To explore an optical approach for controlling valley degrees of freedom in 2D Dirac materials.
  • To demonstrate the generation of valley-polarized currents using Floquet engineering.
  • To propose and numerically verify an optically controlled valley valve based on this principle.

Main Methods:

  • Utilizing intense light to break electronic symmetries in 2D Dirac materials.
  • Exploiting Floquet physics to engineer quasienergy structures and induce valley polarization.
  • Numerical simulations to study the valley valve effect in graphene and related materials.
  • Assessing the robustness of the proposed mechanism against disorder and parameter variations.

Main Results:

  • Intense light induces distinct quasienergy structures for different valleys.
  • This leads to the generation of highly polarized valley currents.
  • An optically controlled valley valve functionality is demonstrated.
  • The proposed valleytronics effect shows robustness against moderate disorder and optical parameter deviations.

Conclusions:

  • Optical control of valley degrees of freedom is achievable in 2D Dirac materials.
  • Floquet engineering provides a pathway to realize optically tunable valleytronics.
  • The proposed valley valve offers a promising route for quantum information processing applications.