Summary
We consider dynamical tunneling between two symmetry-related regular islands that are separated in phase space by a chaotic sea. Such tunneling processes are dominantly governed by nonlinear resonances, which induce a coupling mechanism between “regular” quantum states within and “chaotic” states outside the islands. By means of a random matrix ansatz for the chaotic part of the Hamiltonian, one can show that the corresponding coupling matrix element directly determines the level splitting between the symmetric and the antisymmetric eigenstates of the pair of islands. We show in detail how this matrix element can be expressed in terms of elementary classical quantities that are associated with the resonance. The validity of this theory is demonstrated with the kicked Harper model.
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It should be noted that the annular billiard is exceptionally nongeneric insofar as it exhibits a coexistence of an exactly integrable dynamics in the regular islands with a mixed dynamics in the chaotic sea. Nonlinear classical resonances do therefore not at all manifest within the islands, which means that the central mechanism leading to dynamical tunneling between the islands might be completely different from the generic case.
S. Wimberger, P. Schlagheck, C. Eltschka, and A. Buchleitner, in preparation.
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Schlagheck, P., Eltschka, C., Ullmo, D. (2006). Resonance- and Chaos-Assisted Tunneling. In: Progress in Ultrafast Intense Laser Science Volume I. Springer Series in Chemical Physics, vol 84. Springer, Berlin, Heidelberg . https://doi.org/10.1007/3-540-34422-5_7
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