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Vacuum Spin LED: First Step towards Vacuum Semiconductor Spintronics.

Oleg E Tereshchenko1,2, Vladimir A Golyashov1,2, Vadim S Rusetsky1,3

  • 1Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia.

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Summary
This summary is machine-generated.

This study introduces a vacuum spin LED for efficient spin-polarized electron generation and detection in semiconductor spintronics. This novel approach bypasses traditional barriers, enabling new possibilities for spin manipulation.

Keywords:
electronsnegative electron affinityoptical orientationquantum wellsspinspin LEDspintronics

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Area of Science:

  • Semiconductor spintronics
  • Vacuum electronics
  • Optoelectronics

Background:

  • Efficient spin generation, injection, and detection are crucial for semiconductor spintronics.
  • Current methods often require complex semiconductor structures like p-n junctions or barriers.
  • A need exists for simpler, more efficient spin manipulation techniques.

Purpose of the Study:

  • To introduce a novel concept for spin-polarized electron emission/injection using a vacuum spin-polarized light-emitting diode (spin VLED).
  • To demonstrate the measurement of injected free electron beam polarization in III-V heterostructures via polarized cathodoluminescence (CL).
  • To enable spin-polarized electron coupling without magnetic materials or fields.

Main Methods:

  • Development of spin VLEDs comprising a vacuum tube with spin-polarized electron source and III-V heterostructure detector.
  • Activation of both source and detector to a negative electron affinity (NEA) state.
  • Utilizing polarized cathodoluminescence (CL) for detecting spin polarization.

Main Results:

  • Demonstrated successful spin-polarized electron emission and injection using the spin VLED.
  • Achieved a spin-current detection efficiency of 27% at room temperature.
  • Established a method for coupling photon helicity and electron spin angular momentum without magnetic fields.

Conclusions:

  • The developed spin VLED offers a novel pathway for optical generation and manipulation of spin polarization in vacuum semiconductor spintronics.
  • This technology simplifies spin injection and detection processes.
  • Paves the way for advancements in vacuum-based spintronic devices.