Spin-polarization dynamics in InGaAs quantum dots during pulsed electrical spin-injection

Asshoff, Pablo; Löffler, Wolfgang; Zimmer, Jochen; Füser, Heiko; Flügge, Harald; Kalt, Heinz; Hetterich, Michael
November 2009
Applied Physics Letters;11/16/2009, Vol. 95 Issue 20, p202105
Academic Journal
We investigate the fidelity of electron spin initialization in quantum dots utilizing nanosecond-pulsed electrical spin injection through a semimagnetic spin aligner in a spin light-emitting diode. At the onset of the electroluminescence signal, the circular polarization degree of the emitted light, corresponding to the spin polarization degree, is distinctively higher than under constant-current excitation. The observed spin-polarization dynamics are attributed to state filling effects. Additional contributions due to spin-flip mechanisms within the optically active region are identified.


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