Magnetic modulations of optical and transport properties of N-doped coupled double quantum wells

摘要

Magnetoquantum resistance (MR) in a perpendicular magnetic field B(sub perpendicular) and photoluminescence (PL) spectra are shown to be sensitively modulated by an in-plane field B(sub parallel) due to the B(sub parallel)-induced anticrossing of the energy-dispersion curves of the two quantum wells (QWs). Using a self-consistent density functional theory, they find very different B(sub parallel)-evolutions of the PL spectra for symmetric and asymmetric double QWs consistent with recent data. The MR is calculated using a linear response theory. The results consist of a superposition of two series of MR oscillations represented by ridges running nearly perpendicular to each other in the B = B(sub parallel), B(sub perpendicular) plane. The data from GaAs/AlGaAs double QWs agree with this behavior.