Quantum Arnol'd Diffusion in a Simple Nonlinear System

Details Quantum Arnol'd Diffusion in a Simple Nonlinear System Quantum Arnol'd Diffusion in a Simple Nonlinear System

2002-05-12

arxiv.org/abs/quant-ph/0205062v1

Phys.Rev. E66 (2002) 036211

Physics

Quantum Physics

RevTex, 11 pages including 12 ps-figures

Scientific paper

10.1103/PhysRevE.66.036211

We study the fingerprint of the Arnol'd diffusion in a quantum system of two coupled nonlinear oscillators with a two-frequency external force. In the classical description, this peculiar diffusion is due to the onset of a weak chaos in a narrow stochastic layer near the separatrix of the coupling resonance. We have found that global dependence of the quantum diffusion coefficient on model parameters mimics, to some extent, the classical data. However, the quantum diffusion happens to be slower that the classical one. Another result is the dynamical localization that leads to a saturation of the diffusion after some characteristic time. We show that this effect has the same nature as for the studied earlier dynamical localization in the presence of global chaos. The quantum Arnol'd diffusion represents a new type of quantum dynamics and can be observed, for example, in 2D semiconductor structures (quantum billiards) perturbed by time-periodic external fields.

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