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(Color online) Plan view and cross section of the device with indicated heterostructure material systems. and are the active area length and width, respectively. The table shows the characteristics of the samples.
dc characteristics of the fabricated devices for different and biases.
Photoresponse signal showing excitation of plasmon instability for two samples and normal HEMT (solid line). Experiment was performed at .
(Color online) Fourier spectrum of samples when , laser pulse irradiated the device. , , and .
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