RABI OSCILLATIONS IN SEMICONDUCTOR SUPERLATTICES

We investigate the dynamics of a semiconductor superlattice driven by an ac electric field by solving numerically the one-dimensional time-d ependent Schrodinger equation including interface roughness effects. R abi oscillations between minibands are clearly identified under resona nt conditions, but we show that their lifetime is controlled by a char acteristic time that depends on the superlattice deviation from perfec tion and is independent of the electric field. Experiments for the obs ervation of the predicted effects are proposed. [[S0163-1829(98)01327- 7].