Cyclotron-resonance linewidth oscillations in the integer and fractional quantum Hall regimes
- 15 December 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 36 (17) , 9155-9159
- https://doi.org/10.1103/physrevb.36.9155
Abstract
The cyclotron-resonance linewidth was studied in GaAs/GaAlAs heterostructures as a function of filling factor, magnetic field, and frequency. Maxima in the cyclotron-resonance linewidth are found for integer and for fractional Landau-level fillings of (5/3, (4/3, and (2/3, giving evidence for a reduced screening due to density-of-states gaps. For partly filled levels a strong reduction of the linewidth due to resonant screening is found. The oscillations in the linewidth are highest for high-mobility and low-density samples.Keywords
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