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Even denominator filling factors in the thermoelectric power of a 2DEG |
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| Authors: | S A J Wiegers B Tieke U Zeitler R Fletcher A K Geim J C Maan M Henini |
| Institution: | 1.High Field Magnet Laboratory,University of Nijmegen,Nijmegen,The Netherlands;2.Grenoble High Magnetic Field Laboratory,MPI-CNRS,Grenoble Cedex 9,France;3.Department of Physics,University of Nottingham,Nottingham,UK;4.Physics Department,Queen's University,Kingston,Canada |
| Abstract: | We have investigated the interaction of phonons with a 2DEG in the FQH 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 T4 dependence of the CF TEP. |
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