A. Raymond et al., Oscillations of 2D electron density in GaAs/Ga0.67Al0.33As heterostructures in the QHE regime, SEMIC SCI T, 14(10), 1999, pp. 915-920
Cyclotron resonance (CR) and quantum transport measurements are performed o
n three GaAs/Ga0.67Al0.33As heterostructures in the quantum Hall regime at
T = 2 K. The relaxation time and the 2D electron density N-s are determined
fitting the CR transmission curves by the Drude-type model. In all samples
the density N-s exhibits oscillations as a function of magnetic field. The
de quantum transport is also studied on the same structures and, assuming
that the Hall resistance determines the electron density at all fields, one
obtains density oscillations similar to those measured by CR. This density
behaviour is modelled using a reservoir hypothesis.