Nanosecond far infra red magnetospectroscopy of GaAs/AlGaAs heterostructures

• Published in: Surface science Vol. 196; no. 1; pp. 303 - 309
• Main Authors: Rikken, G.L.J.A., Wyder, P., Ploog, K., Chamberlain, J.M., Grimes, R.T., Hill, G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1988
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(88)90699-1

Short pulses (10–100 ns) of FIR radiation with very sharp cut-off are used to measure the photoconductivity (PC) and transmission of high mobility GaAs/AlGaAs heterostructures. The photoconductive response at cyclotron resonance (CR) does not saturate at intensities up to 100 W cm −2, and corresponds to an increase in α xx . An oscillatory PC (essentially periodic in 1/ B) is also observed which is non-resonant in laser wavelength and which can be accounted for by a simple heating mechanism. The decay times for CR and non-resonant PC are the same (∼20 ns) and are slightly sample- dependent. The decay time for transmission CR (< 3 ns) is detector-limited.