Strong photoresponse of edge two-dimensional electrons in a magnetic field

• URL: http://arxiv.org/abs/2608.13811v1
• Date: Thu, 13 Aug 2026 22:48:10 GMT
• Title: Strong photoresponse of edge two-dimensional electrons in a magnetic field
• Abstract summary: Under microwave and terahertz radiation, photon absorption by electrons provides a pathway to realising sensitive radiation detection.<n>We develop a detailed quantum theory of the photocurrent generated in such a system by an incident electromagnetic wave.<n>We also demonstrate that the resulting photoresponse in III-V semiconductor structures can be orders of magnitude higher than that measured in graphene.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Electrons in two-dimensional electron gases in the presence of an out-of-plane magnetic field propagate along the edge with a high velocity of the order of the Fermi velocity. Under microwave and terahertz radiation, photon absorption by these electrons provides a pathway to realising sensitive radiation detection. Here, we develop a detailed quantum theory of the photocurrent generated in such a system by an incident electromagnetic wave and propose an experimental geometry for observing the predicted phenomenon. By using suitably arranged radiation confinement structures, a strong photocurrent generation efficiency can be obtained. We also demonstrate that the resulting photoresponse in III-V semiconductor structures can be orders of magnitude higher than that measured in graphene.

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