Quantifying electrical spin injection: Component-resolved electroluminescence from spin-polarized light-emitting diodes
Date
2001Author
Jonker, B. T.Hanbicki, A. T.
Park, Y. D.
Itskos, Grigorios
Furis, M.
Kioseoglou, G.
Petrou, Athos Chariton
Wei, X.
Source
Applied Physics LettersVolume
79Issue
19Pages
3098-3100Google Scholar check
Metadata
Show full item recordAbstract
The spin-polarized light-emitting diode (spin-LED) is a very effective tool for accurately quantifying electrical spin injection in a model independent manner. We resolve and identify various components which occur in the electroluminescence (EL) spectra of GaAs quantum-well-based spin-LEDs, and examine the circular polarization of each. While a number of components exhibit significant circular polarization, the values do not necessarily reflect the electrical spin injection efficiency. We show that a reliable measure of spin injection efficiency can be obtained only if one takes care to spectroscopically resolve and accurately identify the free exciton or free carrier components of the EL spectrum, and exclude other components. © 2001 American Institute of Physics.