C Stellmach et al 2004 Semicond. Sci. Technol. 19 S454 doi:10.1088/0268-1242/19/4/149
C Stellmach1, A Hirsch1, N G Kalugin1, G Hein2, B E Sağol1,2 and G Nachtwei1
Show affiliationsRecent investigations showed that the THz photoresponse of quantum Hall systems (QHS) is a complex combination of different mechanisms. In this work, we separate these parts by varying the electron concentration and the source–drain current. For our photoconductivity measurements, we used a pulsed p-Ge cyclotron laser as a monochromatic THz radiation source and changed the magnetic field, the source–drain current and the electron concentration (via a backgate) of the QH sample. The spectral resolution of the QHS was found to improve with increasing values of the source–drain current up to the breakdown of the QH effect.
Condensed matter: electrical, magnetic and optical
Issue 4 (April 2004)
Received 28 July 2003
Published 15 March 2004
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