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Emissions of cyclotron radiation associated with the inter-Landau-level transition of nonequilibrium electrons are experimentally studied in quantum-Hall-effect devices. It is confirmed that both the longitudinal resistance and the contact resistance are vanishing when the cyclotron emission ͑CE͒ is being observed. For the CE, a critical source-drain voltage V SD is found to exist at V SD ϭប c /2e, where ប c is the inter-Landau-level energy spacing. Spatially resolved measurements reveal thatdoi:10.1103/physrevb.59.12537 fatcat:bjqlvvuptzgmzf7o4g73oljami