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(a) STM topographic image of the heterostructure. The image was recorded at , , and . Scan size is . (b) Corresponding BEEM image recorded simultaneously with the STM image. The color scale corresponds to a collector current range of .
(a) Averaged BEEM spectra for different temperatures between 300 and . For better viewing, all curves were normalized. (b) Temperature dependence of the measured SBH with error bars and a linear fit to the data.
Schematic view of the experimental setup. The conduction band profile of our sample ( valley at ) and the higher and valleys in valleys for GaAs are also shown. is the Fermi energy of the sample, is the tunneling voltage, and is the ballistic current.
Averaged BEEM spectrum (curve 1) (left axis). Curve 2 (right axis) is the first derivative. Both curves are plotted at room temperature.
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