STOCHASTIC RESONANCE AND NONLINEAR RESPONSE IN DOUBLE-QUANTUM-WELL STRUCTURES

Coherent motion of a wave packet in a double-quantum-well structure ca n be induced by irradiating it with a weak resonant laser field. The a mplitude of this motion exhibits a ''stochastic resonance'' as a funct ion of the relaxation rate in the double well and of the field amplitu de. The maximum oscillation amplitude at each temperature does not dep end on the field amplitude, demonstrating the failure of linear-respon se theory td describe the quantum stochastic resonance.