Detection of electrical spin injection by light-emitting diodes in top- and side-emission configuration
R. Fiederling, P. Grabs, W. Ossau, G. Schmidt, and L.W. Molenkamp
TL;DR
This study compares the effectiveness of top- and side-emission configurations in detecting electrical spin injection in (Al,Ga)As spin-LEDs, revealing detection limitations in side-emission.
Contribution
It provides a comparative analysis of detection efficiency in different emission configurations of spin-LEDs, highlighting the challenges in side-emission detection.
Findings
Electrical spin injection detected in top emission
No detection of spin injection in side emission
Reduced mesa size minimizes optical pumping effects
Abstract
Detection of the degree of circular polarization of the electroluminescence of a light-emitting diode fitted with a spin injecting contact (a spin-LED) allows for a direct determination of the spin polarization of the injected carriers. Here, we compare the detection efficiency of (Al,Ga)As spin-LEDs fitted with a (Zn,Be,Mn)Se spin injector in top- and side-emission configuration. In contrast with top emission, we cannot detect the electrical spin injection in side emission from analysing the degree of circular polarization of the electroluminescence. To reduce resonant optical pumping of quantum-well excitons in the side emission, we have analysed structures with mesa sizes as small as 1 micron.
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