Coherent control of intersubband optical bistability in quantum wells

Research paper by H. O. Wijewardane, C. A. Ullrich

Indexed on: 20 Dec '03Published on: 20 Dec '03Published in: Physics - Mesoscopic Systems and Quantum Hall Effect


We present a study of the nonlinear intersubband (ISB) response of conduction electrons in a GaAs/AlGaAs quantum well to strong THz radiation, using a density-matrix approach combined with time-dependent density-functional theory. We demonstrate coherent control of ISB optical bistability, using THz control pulses to induce picosecond switching between the bistable states. The switching speed is determined by the ISB relaxation and decoherence times, T1 and T2.