Resonance effect in an impurity quantum well subject to electric and strong magnetic fields

An analytical approach to the problem of an impurity electron (or hole) in a quantum well (QW) subject to electric and strong magnetic fields, both di rected perpendicular to the heteroplanes, is described. It is shown that th e combined potential acting on the electron resembles that of a double quan tum well. When the levels associated with the two effective QWs anti-cross, the impurity single QW subject to external fields can be treated as a reso nant structure. The explicit dependencies of the resonant splitting upon th e width of the QW, the magnitudes of the electric and magnetic fields, and the position of the impurity centre are obtained. Estimates of the expected splitting and frequency of the emitted radiation relevant to the interwell oscillations of the electron are made using typical values associated with GaAs QWs.