Abstract
The use of magnetocapacitance, magnetoconductance and photoluminescence spectroscopy measurements on asymmetric double barrier resonant tunneling structures is described. Fourier analysis of the magnetocapacitance oscillations can be used to measure the electron space-charge buildup in the quantum well and in the emitter accumulation layer. Thermalization of the resonantly tunneling electrons is observed. The variation of the photoluminescence linewidth with applied voltage also provides a direct signature of the space-charge buildup. Both the photoluminescence and electrical measurements provide clear evidence for sequential tunneling processes.
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