Thermoelectric power in the quantum-Hall regime at very low temperatures
نویسنده
چکیده
We have measured the thermoelectric power (TEP) of high mobility 2DEGs in the integer and fractional quantum Hall regime down to 100 mK. At low temperatures, fluctuation-like structures in the TEP are observed. Below 160 mK the TEP diverges around the filling factor v = ~ where the resistivity enters the insulating phase. The temperature dependence of the TEP at filling factors v = 12 and 1⁄4 resembles that of the zero field TEP enhanced by a constant factor. This is interpreted in terms of the phonon drag of composite fermions.
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تاریخ انتشار 2017