Phonon-drag thermopower of composite fermions at filling factor 3/2

We present, for the first time, a quantitative interpretation of the measured diagonal thermopower, Sxx, for a 2DEG at filling factor ν=3/2. The Sxx data span the temperature range View the MathML source and show that the phonon-drag thermopower, Sxxg, is the dominant contribution at all T. Sxxg is calculated by using the standard Cantrell–Butcher formalism within the composite fermion picture. The theoretical results for Sxxg agree very well with the experimental data when the value 0.87me for the composite fermion mass at ν=3/2 is used. We also calculate the ratio Sxxg(ν=3/2)/Sxxg(ν=1/2) and we find that it is unity for View the MathML source which is in very good agreement with the experiment.