Abstract
Using the bistability of quantum Hall systems in the hysteresis region of the breakdown, we realized a simple relaxation oscillator based on a quantum Hall device with Corbino geometry. Investigations of the performance of such an oscillator revealed the increase of the hysteresis of the current-voltage curve of the device in comparison with the value of hysteresis at dc voltages. By direct measurements of the hysteresis of the current-voltage curve at different frequencies, we have found that a dramatic increase of the breakdown hysteresis happens already at low (Hz-range) frequencies. We explain the observed dynamical enhancement of the breakdown hysteresis using an electron heating model and the assumption of a decreasing background (delocalization-related) component of the conductivity with increasing frequency.
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