Abstract
For the first time the quantum Hall effect was observed in at microwave frequencies in the two-dimensional electron gas in GaAs-As using a crossed waveguide arrangement. These frequencies were – higher than those used in previous experiments where a so-called low-frequency breakdown of the integer quantum Hall effect was observed. Our microwave results show that this effect does not occur in GaAs-As heterostructures. Therefore, we have to rule out the mechanism of an effective delocalization at low frequencies and the existence of long semiclassical orbits in the sample.
- Received 26 July 1985
DOI:https://doi.org/10.1103/PhysRevB.33.2965
©1986 American Physical Society