Non-perturbative response: chaos versus disorder

Quantized chaotic systems are generically characterized by two energy scales: the mean level spacing $\mathrm{\Delta }$, and the bandwidth ${\mathrm{\Delta }}_b\propto \mathrm{\hslash }$. This implies that with respect to driving such systems have an adiabatic, a perturbative, and a non-perturbative regimes. A “strong” quantal non-perturbative response effect is found for {\em disordered} systems that are described by random matrix theory models. Is there a similar effect for quantized {\em chaotic} systems? Theoretical arguments cannot exclude the existence of a “weak” non-perturbative response effect, but our numerics demonstrate an unexpected degree of semiclassical correspondence.