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(Color online) Relevant wave functions and conduction band diagram of one period of a QCD for . The phonon ladder for vertical electron transport is very well visible in this schematic drawing.
(Color online) Standing on the bottom axis: spectral response curves of the QCD at as a function of temperature (from top to bottom: 10, 50, 100, 150, 200, 250, and ). Hanging from the top axis, the double-pass absorption spectrum at room temperature is shown. The spectral position of one of the DFB lasers is also shown at .
(Color online) (a) Schematic drawing of the optical heterodyne setup. The two QCL beams are overlaid from behind the beam splitter and until they reach the QCD. (b) Electric circuit which was used for fitting the measured cutoff behavior.
(Color online) Frequency responses of a QCD operated at room temperature and for two differently connected devices. The upper curve (circles) corresponds to a device with a long bond wire, whereas the lower curve (squares) describes the mounting with the longer bond. The dots are measured data points, whereas the two solid curves are fits using the model mentioned in the text. The upper curves are errors between experiment and fit measured in decibels.
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