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Controllable quantum valley pumping with high current in a silicene junction.

H Khani1, M Esmaeilzadeh, F Kanjouri

  • 1Department of Physics, Kharazmi University, 31979-37551, Tehran, Iran.

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|November 10, 2016
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Summary

We demonstrate a simple method to generate and control pure, polarized valley currents in silicene using quantum pumping. This electrical control offers a significant advancement over existing graphene-based techniques.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Valleytronics explores using electron valley degrees of freedom for information processing.
  • Silicene, a silicon analog of graphene, exhibits unique electronic properties.
  • Quantum pumping offers a method for generating controlled charge currents.

Purpose of the Study:

  • To propose an efficient scheme for generating and controlling pure and fully polarized valley currents in silicene.
  • To investigate electrical switching of valley currents between K and K' valleys.
  • To compare the proposed method with existing techniques for valley current generation.

Main Methods:

  • Adiabatic quantum pumping in a silicene-based junction.
  • Utilizing ferromagnetic proximity to induce valley polarization.
  • Applying a perpendicular electric field for current control and switching.

Main Results:

  • Achieved generation of pure and fully polarized valley currents.
  • Demonstrated electrical switching of valley currents by reversing the electric field direction.
  • Observed pumped current magnitudes in silicene approximately one order of magnitude greater than in graphene.
  • Showcased the potential for generating pure and fully polarized spin currents.

Conclusions:

  • The proposed adiabatic quantum pumping scheme provides an efficient and electrically controllable method for valley current generation in silicene.
  • This approach is simpler and more practical than strain-based methods in graphene.
  • Silicene-based devices show promise for enhanced valleytronics and spintronics applications.