We measure a clear terahertz response in the low-temperature conductance of a quantum point contact at 1.4 and 2.5THz. We show that this photoresponse does not arise from a heating effect, but that it is instead excellently described by a classical model of terahertz-induced gate-voltage rectification. This effect is distinct from the rectification mechanisms that have been studied previously, being determined by the phase-dependent interference of the source drain and gate voltage modulations induced by the terahertz field.
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Song et al. (2008) studied this question.
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