Temperature dependence of the photoluminescence of self-assembled InAs/GaAs quantum dots in pulsed magnetic fields.

We have studied the magnetic field ( 100 K) a different physical phenomenon emerges: we see an anomalous decrease of the PL shift in magnetic field, which is attributed to field-enhancement of the quantum dot barrier potential. This mechanism strongly favors excitons in small dots with a weak PL shift in magnetic field, hence laterally smaller dots increasingly dominate the PL at high temperatures and high fields.

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