CLASSICAL RESONANCE IN THE QUANTUM DYNAMICS OF THE DRIVEN SURFACE-STATE ELECTRON MODEL

The quantum dynamics of a Gaussian wavepacket in the quantum phase spa ce of the driven surface state electron (SSE) Hamiltonian is studied. Using the Husimi phase space representation of quantum mechanics we de monstrate that the prominent KAM island persists in the quantum domain as the dynamical barrier which prevents the wavepacket from exploring the classically inaccessible regions. The structure of classical phas e space is clearly manifested in the properties of the Floquet states dominating the dynamics of the wavepacket.