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PC spectra of the MQW sample measured at under different bias voltages of , , , , and . The notation indicates the heavy-hole (light-hole) exciton transition between th electron and th heavy-hole (light-hole) subbands. The base lines of the PC spectra are vertically shifted for clarity.
PC spectra of the MQW sample measured at 20, 40, 60, and under a fixed bias voltage of . The base lines of the PC spectra are vertically shifted for clarity.
(a) PC intensity of the MQW sample as a function of time measured at under the bias voltage of . The illumination wavelength is and the maximum power is about . The illumination power is instantaneously changed at 180 and . The PC intensity is temporally oscillating with a characteristic frequency that depends on the illumination power. (b) Close-up of the region I, where the illumination power is maximum . (c) Close-up of the region II, where the illumination power is reduced to 50%.
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