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Point contact readout for a quantum dot terahertz sensor
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View: Figures


Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

(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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Point contact readout for a quantum dot terahertz sensor