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Scanning electron microscopy picture of the experimental sample (a) and a schematic view of sample components (b). A QD is formed in 2DEG and probed by a SET or a PC.
Conductance of a SET at fixed . Periodicity changes from when the QD becomes isolated from the 2DEG. Close to the pinch-off boundary thermal excitation of electrons out of the QD are seen as random telegraph noise in conductance.
(a) Current through the PC close to the pinch-off boundary in dark (dash) and under illumination (solid). . Photoresponse measured with the lock-in technique (open circles). (b) Intensity map of the PC current, white corresponds to current , and dark gray to the zero current. A dashed line indicates pinch-off of the QD.
(a) Photoresponse of the QD-PC sensor as a function of for different powers dissipated on the emitter: no power (solid line), (open squares), and (open circles). (b) Power dependence of photoresponse at 0.3 and , .
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