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THz induced giant spin and valley currents.

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Researchers developed a "hencomb" laser pulse to precisely control spin and valley currents in 2D materials. This breakthrough enables ultrafast manipulation of quantum states for spintronics and valleytronics applications.

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Area of Science:

  • Quantum physics
  • Materials science
  • Condensed matter physics

Background:

  • Spin and valley are crucial quantum labels for quasiparticles in 2D materials.
  • Spintronics and valleytronics aim to control these quantum degrees of freedom.
  • Achieving precise control over spin and valley currents remains a significant challenge.

Purpose of the Study:

  • To demonstrate a novel method for generating pure spin and valley currents.
  • To investigate the use of tailored femtosecond laser pulses for quantum control.
  • To explore ultrafast light-based manipulation of spin and valley states.

Main Methods:

  • Utilizing a femtosecond laser pulse combining circularly polarized optical light and linearly polarized terahertz (THz) light (a "hencomb" pulse).
  • Investigating the generation of spin and valley currents in WSe2 and bilayer graphene.
  • Analyzing the purity and control parameters of the generated currents.

Main Results:

  • Achieved 90% pure spin currents in WSe2.
  • Generated >75% pure valley currents in bilayer graphene with large energy gaps (>120 meV).
  • Identified the optical frequency and THz polarization as key control parameters.

Conclusions:

  • The "hencomb" pulse provides precise control over spin and valley currents.
  • This method enables ultrafast, light-driven manipulation of quantum states.
  • Opens new avenues for advanced spintronics and valleytronics devices.