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Even denominator filling factors in the thermoelectric power of a 2DEG
Wiegers, S A J; Tieke, B; Zeitler, U; Fletcher, R; Geim, A K; Maan, J C; Henini, M
Czechoslovak Journal of Physics. 1996;46:2461-2462.
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Abstract
We have investigated the interaction of phonons with a 2DEG in the FQII regime with phonon drag thermoelectric power (TEP). We find that the TEP at filling factors with the same even denominator is identical and at other even denominator filling factors they differ only by a constant. Assuming these states to be Composite Fermions (CF), we can explain our observations by extending a zero magnetic field theory for phonon drag to the CF-phonon interaction. This analysis is further corroborated by the observed T-4 dependence of the CF TEP.
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