Abstract
The temperature and magnetic field dependences of the resonant frequency and dissipation of a mechanical oscillator containing a two-dimensional electron system have been measured. At fixed temperature, the resonant frequency and dissipation both showed magnetic field dependent effects which correlate with the integral quantum Hall oscillations of σ xx measured on the same wafer. At low temperatures, 25 mK, transport measurements showed well developed 4 3 and 5 3 fractional Hall plateaus. Similar effects, but of smaller magnitude, have been seen with the oscillator in these states.
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