W. Knap et al., STUDY OF TRANSPORT, PHASE, AND SPIN RELAXATION-TIMES OF 2D ELECTRONS BY MEANS OF PRESSURE, Physica status solidi. b, Basic research, 198(1), 1996, pp. 267-281
We report magnetoconductivity experiments carried out on pseudomorphic
AlGaAs/InGaAs/GaAs quantum wells in a wide range of magnetic fields (
0.1 to 80 kG). Pressure-illumination cycles were used for tuning tile
free electron density. Measurements of the Shubnikov-de Haas and Hall
effects allowed us to determine tile transport and quantum relaxation
times. Corrections to the magnetoconductivity due to weak localization
and weak antilocalization were determined and used to calculate the p
hase and spin relaxation times. We analyzed phase, spin, quantum, and
transport relaxation rates as a function of electron density which all
owed for a characterization of the dominant scattering processes.