Abstract
The photovoltaic response of a two-dimensional electron system (2DES) is investigated in strong magnetic fields at 4.2 K using a long channel device with a Schottky gate. When the 2DES is in the quantum Hall (QH) regime, a large negative photovoltage is observed at the gate. The spectrum of the photovoltage is shifted towards the higher photon energy with respect to the cyclotron resonance of the bulk 2DES, suggesting that the photovoltage is caused by photo-absorption at the edge states. The filling factor dependence of the photovoltage spectrum suggests a nonparabolic edge state dispersion.
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