Diessel, E. and Müller, G. and Weiss, Dieter and Klitzing, Klaus von and Ploog, K. and Nickel, H. and Schlapp, W. and Lösch, R.
Huge Photoresponse in the Nonlocal Transport Regime.
Europhysics Letters 24, pp. 785-790.
Other URL: http://www.iop.org/EJ/abstract/0295-5075/24/9/015, http://epljournal.edpsciences.org/
We present experiments showing a significantly increased FIR photosensitivity of a high-mobility two-dimensional electron gas when transport in the quantum Hall regime is non-local, i.e. when scattering between adjacent edge channels is suppressed on macroscopic length scales. The resonant absorption under cyclotron resonance conditions enhances interedge channel scattering processes leading to a huge resistance maximum in the longitudinal resistance and to the suppression of the non- local resistance.