Year: 2013
Type: article
Abstract: Electric luminescence and its circular polarization in a Co 2 MnAl injector-based light emitting diode (LED) has been detected at the transition of e−A 0 C , where injected spin-polarized electrons recombine with bound holes at carbon acceptors. A spin polarization degree of 24.6% is obtained at 77 K after spin-polarized electrons traverse a distance of 300 nm before they recombine with holes bound at neutral carbon acceptors in a p + -GaAs layer. The large volume of the p + -GaAs layer can facilitate the detection of weak electric luminescence (EL) from e−A 0 C emission without being quenched at higher bias as in quantum wells. Moreover, unlike the interband electric luminescence in the p + -GaAs layer, where the spin polarization of injected electrons is destroyed by a very effective electron—hole exchange scattering (BAP mechanism), the spin polarization of injected electrons seems to survive during their recombination with holes bound at carbon acceptors.
Source: Chinese Physics B
Authors: Si-Peng Yuan, Chao Shen, Hou-Zhi Zheng, Qi Liu, Li-Guo Wang, Kang-Kang Meng, Jian-Hua Zhao
Institutions: Chinese Academy of Sciences, Institute of Semiconductors
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Award: 高品质半导体自旋电子材料制备及其自旋量子调控
OpenAlex ID: W2120975936