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Even-denominator filling factors in the thermoelectric power of a two-dimensional electron gas
Tieke, B; Zeitler, U; Fletcher, R; Wiegers, S A J; Geim, A K; Maan, J C; Henini, M
Physical Review Letters. 1996;76(19):3630-3633.
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Abstract
We have investigated the interaction of phonons with a two-dimensional electron gas in the fractional quantum Hall regime with phonon drag thermoelectric power (TEP). The TEPs at filling factors with the same even denominator are found to be identical; at other even-denominator filling factors they differ only by a constant factor. Treating these states as composite fermions, the findings are explained by a zero magnetic field theory for phonon drag. A maximum observed in the TEP at nu = 1/2 is modeled by a weakly diverging effective mass of the composite fermions at this filling factor.
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3d phonons; landau-level; phonon-drag contribution; thermopower
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- Related website <Go to ISI>://A1996UW49000041
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