Graphene-based quantum Hall effect infrared photodetector operating at liquid Nitrogen temperatures

We demonstrate a quantum Hall effect (QHE) graphene-based infrared photodetector that functions at 70K-a temperature achievable using liquid Nitrogen in vapor evacuation regime. This result opens up the possibility of wider use of QHE photodetectors if graphene is utilized instead of "classical" materials with two-dimensional electron gas. The potential advantages to this approach are increased operating temperature, reduced magnetic field, and wider range of operating frequency compared to previous implementations of QHE detectors. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3609320]