When a regular classical system is perturbed, non-linear resonances appear asprescribed by the KAM and Poincar\`{e}-Birkhoff theorems. Manifestations ofthis classical phenomena to the morphologies of quantum wave functions arestudied in this letter. We reveal a systematic formation of an universalstructure of localized wave functions in systems with mixed classical dynamics.Unperturbed states that live around invariant tori are mixed when they collidein an avoided crossing if their quantum numbers differ in a multiple to theorder of the classical resonance. At the avoided crossing eigenstates arelocalized in the island chain or in the vicinity of the unstable periodic orbitcorresponding to the resonance. The difference of the quantum numbersdetermines the excitation of the localized states which is reveled using thezeros of the Husimi distribution.
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