Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 9: Poster 1
HL 9.46: Poster
Montag, 23. März 2009, 14:30–17:00, P2
Magnetotransport and THz photoresponse of combined Hall- Corbino- devices patterned on HgCdTe based wafers. — •Fathi Gouider1, Christof Brüne3, Jens Könemann2, Yuri Vasilyev4, Marek Bugar5, and Georg Nachtwei1 — 1Institut für Angewandte Physik, TU-Braunschweig, Mendelssohnstraße 2, D-38106 Braunschweig, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany — 3Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 4A.F. Ioffe Physical Technical Institute, Polytekhnicheskaya 26, 194021 St. Petersburg, Russia — 5Institute of Physics, Charles University in Prague, Ke Karlovn 5, 121 16 Prague2 , Czech Republic
Quantum- Hall- (QH) - systems are discussed as promising THz detectors. In this presentation we present photoconduction measurements of the HgTe/HgCdTe- (MCT) - Quantum well in Hall bar, Corbino as well as combined Corbino- Hall bar geometry in the quantum-Hall- (QH) - regime accomplished. FIR photoconduction measurements of the MCT samples are done to supply a contribution for the basic research of the photoconduction at QH-systems and in addition to contribute to the development of a sensitive as well as spectrally adjustable QH detectors. The materiel system MCT is due to the small effective mass (compared with GaAs) and the smaller magnetic fields for operation of interest. For the measurements a superconducting 10 T-magnet and an adjustable p-Ge cyclotron resonance laser are operated ( the laser as FIR source, wave-length range of 120 - 180µ m).