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- Title
Vacuum Spin LED: First Step towards Vacuum Semiconductor Spintronics.
- Authors
Tereshchenko, Oleg E.; Golyashov, Vladimir A.; Rusetsky, Vadim S.; Kustov, Danil A.; Mironov, Andrey V.; Demin, Alexander Yu.
- Abstract
Improving the efficiency of spin generation, injection, and detection remains a key challenge for semiconductor spintronics. Electrical injection and optical orientation are two methods of creating spin polarization in semiconductors, which traditionally require specially tailored p-n junctions, tunnel or Schottky barriers. Alternatively, we introduce here a novel concept for spin-polarized electron emission/injection combining the optocoupler principle based on vacuum spin-polarized light-emitting diode (spin VLED) making it possible to measure the free electron beam polarization injected into the III-V heterostructure with quantum wells (QWs) based on the detection of polarized cathodoluminescence (CL). To study the spin-dependent emission/injection, we developed spin VLEDs, which consist of a compact proximity-focused vacuum tube with a spin-polarized electron source (p-GaAs(Cs,O) or Na2KSb) and the spin detector (III-V heterostructure), both activated to a negative electron affinity (NEA) state. The coupling between the photon helicity and the spin angular momentum of the electrons in the photoemission and injection/detection processes is realized without using either magnetic material or a magnetic field. Spin-current detection efficiency in spin VLED is found to be 27% at room temperature. The created vacuum spin LED paves the way for optical generation and spin manipulation in the developing vacuum semiconductor spintronics.
- Subjects
ELECTRON affinity; SPINTRONICS; PHOTOEMISSION; POLARIZED electrons; SEMICONDUCTORS; SPIN polarization
- Publication
Nanomaterials (2079-4991), 2023, Vol 13, Issue 3, p422
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano13030422