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Miniature quantum-well microwave spectrometer operating at liquid-nitrogen temperatures
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View: Figures


Image of FIG. 1.
FIG. 1.

Examples of the calculated (a) constructive and (b) destructive interference of EMPs emitted by a pair of contacts placed at the edge of the 2DES apart along the axis at and . Here, is the EMP potential. The density and mobility of the 2D electrons are and ; the frequency equals . (c) The calculated microwave induced dc voltage, which appears between a pair of potential probes for various frequencies and a sample with , , , and a potential probe width . It is assumed that there are three potential contacts along the side of the Hall bar. The EMPs propagate in the direction from contact 1 to contact 3. The dc voltage at the contact is taken proportional to and the voltage , shown on the plot, develops between contacts 2 and 3. Curves are shifted vertically for clarity. Insets schematically illustrate the distribution of microwave-induced charges near the contacts where EMPs are emitted.

Image of FIG. 2.
FIG. 2.

Magnetic field dependence of the microwave induced photovoltage for (a) and (b) for two different temperatures and incident power at the entrance of the microwave waveguide. The electron density is and for both plots. (c) Microwave induced photovoltage vs field at for two different frequencies and .

Image of FIG. 3.
FIG. 3.

(a) Temperature dependence of the amplitude of the peak in the FFT of the photovoltage for a device with and . (b) FFT spectra of the photovoltage when radiation is incident on the sample (bottom curve) or when bichromatic radiation of 23 and illuminates the device (top curve).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Miniature quantum-well microwave spectrometer operating at liquid-nitrogen temperatures