Abstract
We have examined the absolute and relative phases of the oscillations (at low magnetic fields) in the resistivity and thermopower of three GaAs-Ga 1− x Al x As heterojunctions. The experimental value for the absolute phase of the resistivity oscillations agrees with the predicted result. We see virtually no phase difference between the resistivity and thermoelectric oscillations contrary to theoretical predictions based on the assumption that the thermopower is due to diffusion effects. This null result reinforces the view that the thermopower is mainly due to phonon drag rather than diffusion effects.
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