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A highly superlinear in radiation intensity photoconductance induced byterahertz laser radiation with moderate intensities has been observed inquantum point contacts made of GaAs quantum wells operating in the deeptunneling regime. For very low values of the normalized dark conductance$G_{\rm dark}/ G_0 \approx 10^{-6}$, with the conductance quantum $G_0=2e^2/h$,the photoconductance scales exponentially with the radiation intensity, so thatalready at $ 100 \text{ mW}/\text{cm}^2$ it increases by almost four orders ofmagnitude. This effect is observed for a radiation electric field orientedalong the source drain direction. We provide model considerations of the effectand attribute it to the variation of the tunneling barrier height by theradiation field made possible by local diffraction effects. We also demonstratethat cyclotron resonance due to an external magnetic field manifests itself inthe photoconductance completely suppressing the photoresponse.

Highly Superlinear Giant Terahertz Photoconductance in GaAs Quantum Point Contacts in the Deep Tunneling Regime