Function principle of a relaxation oscillator based on a bistable quantum Hall device

Nachtwei, G.; Kalugin, N. G.; Sağol, B. E.; Stellmach, Ch.; Hein, G.
March 2003
Applied Physics Letters;3/31/2003, Vol. 82 Issue 13, p2068
Academic Journal
We present a simple relaxation oscillator based on a quantum Hall device with Corbino geometry near the breakdown of the quantum Hall effect. In the hysteresis region of the breakdown, the quantum Hall device exhibits bistable behavior. If a resistance is connected in series and a capacitor in parallel to the quantum Hall device, the bistable switching leads to subsequent charging and discharging of the capacitor, detectable as relaxation oscillations. We explain the observed oscillations by solving Kirchhoff's equations and obtain a good quantitative description of the experiment. From this, we deduce some dynamical parameters of the Corbino device and discuss the performance limits of the oscillator.


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