FIR and transport measurements are undertaken on quasi-2D electron gas (2DEG) in the Quantum Hall Effect (QHE) regime of GaAs heterojunctions by means of cyclotron emission. The heating electric field is varied during the measurements which are conducted as Landau emission experiments in quantizing magnetic fields. Attention is given to the evolution of the emission spectra and the breakdown of the QHE when the electric field increases. Supplementary lines are identified in the FIR spectra that coincide with the minima of the Hall plateaus under low electric-field conditions. The nonhomogeneous distribution of the potential in the Quantum Hall state is examined to explain the supplementary lines. The nonequilibrium carrier distribution under high electric-field conditions leads to narrower Hall plateaus due to the breakdown of the equation Ns

Date Published: 1 February 1991
PDF: 7 pages
Proc. SPIE 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications, (1 February 1991); doi: 10.1117/12.24546

Published in SPIE Proceedings Vol. 1362:
Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications
Manijeh Razeghi, Editor(s)