Corbino field-effect transistors in a magnetic field: Highly tunable photodetectors

We study gated field effect transistors (FETs) with an eccentric Corbino-disk geometry, such that the drain spans its circumference while off-center inner ring acts as a source. An AC THz potential difference is applied between source and gate static source-drain voltage, rectified by nonlinearities of FET electrons, measured. When magnetic perpendicular to device, strong resonance appears at cyclotron frequency. The strength can be tuned changing eccentricity disk. show there optimum value maximizes responsivity FET.