Oscillations in the diffusion thermopower of a two-dimensional electron gas

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.52.2823
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TypeArticle
Journal titlePhysical review. B, Condensed matter and materials physics
Volume52
Issue4
Pages28232830; # of pages: 8
AbstractThe phonon drag thermopower of a two-dimensional electron gas at a GaAs/Ga1-xAlxAs heterojunction has been strongly attenuated by growing the sample on a heavily doped substrate and by working in the liquid 3He temperature range. As a consequence the diffusion thermopower dominates at T<0.5 K, at least at zero magnetic field. The low-field oscillations in the resistivity and thermopower have been investigated. The former behave essentially as predicted. The amplitude of the oscillations in the Nernst-Ettingshausen coefficient show the field and temperature dependence expected for diffusion, although the absolute magnitude is about a factor of 2 too large. The amplitude of the longitudinal thermopower oscillations does not behave as expected for diffusion, although the oscillations exhibit the predicted change in phase as a function of magnetic field.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedNo
NPARC number12328344
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Record identifier42d02cc2-0150-4616-8aa9-0a1ded730f03
Record created2009-09-10
Record modified2016-05-09
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