Abstract
Quantum magnetic oscillations in interface are observed in the magnetoresistance. We study their frequency as a function of gate voltage and the evolution of their amplitude with temperature. The data are consistent with the Shubnikov–de Haas theory. The Hall resistivity is nonlinear at low magnetic fields. is fitted assuming multiple carrier contributions. We infer the density of the mobile charge carriers from the oscillations frequency and from Hall measurements. The comparison between these densities suggests multiple valley and spin degeneracy. The small amplitude of the oscillation is discussed in the framework of the multiple band scenario.
- Received 29 August 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.206401
© 2010 The American Physical Society