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An interpretation of some recent zero-magnetic-field thermopower results in GaAs/AlGaAs heterostructures due to Davidson and coworkers (1986) is presented. The variation of thermopower with temperature can be accounted for by assuming that the first excited sub-band is several meV the Fermi energy and that there is no phonon drag contribution.
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D G Cantrell (1986) studied this question.
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