Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-07-03
Phys. Rev. B 80, 205320 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 5 eps-figures, accepted for Phys. Rev. B
Scientific paper
10.1103/PhysRevB.80.205320
The Teraherz (THz) photoresponse of a two-dimensional electron gas in the quantum Hall regime is investigated. We use a sample structure which is topologically equivalent to a Corbino geometry combined with a cross-gate technique. This quasi-Corbino geometry allows us to directly investigate the THz-induced transport between adjacent edge-states, thus avoiding bulk effects. We find a pronounced photo voltage at zero applied bias, which rapidly decreases when an external current bias is applied. The photo voltage and its dependence on the bias current can be described using the model of an illuminated photodiode, resulting from the reconstruction of the Landau bands at the sample edge. Using the sample as a detector in a Fourier transform spectrometer setup, we find a resonant response from which we extract a reduced effective cyclotron mass. The findings support a non-bolometric mechanism of the induced photo voltage and the proposed edge-channel diode model.
Heitmann Detlef
Lorke Axel
Notthoff Christian
Rachor Kevin
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