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(Color online) (a) Change in resistance of the 2DEG on the left-hand side of the QPC with respect to (a) the temperature of the cold plate, and (b) the Joule heating of the 2DEG to the right. Both measurements for device HCO100-92-30625-2A, with . (c) The resulting temperature of the left 2DEG vs the Joule heat applied to the right reservoir. The thin solid line is a fit to with . At low temperatures, the built-in thermometer becomes less sensitive, resulting in large scattering of data points. The inset to (c) shows the sample layout.
(Color online) (a) Change in the 2DEG resistance vs output power of the rf generator, for sample HCO100-92-30625-2A and (in the IDT passband). (b) Joule heating corresponding to the same change in . Circles, squares, and triangles indicate the data for devices HCO100-92-30625-2A, HCO103-92-30122-2A, and HCO103-92-30122-2E, respectively. In all cases the rf frequency was within the IDT passband, at , 2.4650, and , respectively. The dashed line indicates .
(Color online) Dissipated power vs rf frequency for device HCO100-92-30625-2A. The two curves were obtained by applying the rf signal to either of the two IDTs on the device (left or right), with . The upper trace is vertically shifted by . A zoom up around the SAW resonance frequency is shown in the inset (no vertical offset for the two traces).
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