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Power-law decay of the fraction of the mixed eigenstates in kicked top model with mixed-type classical phase space [Elektronski vir]Wang, Qian, matematik, fizik ; Robnik, Marko, 1954-The properties of mixed eigenstates in a generic quantum system with a classical counterpart that has mixed-type phase space, although important to understand several fundamental questions that arise ... in both theoretical and experimental studies, are still not clear. Here, following a recent work [C. Lozej, D. Lukman, ˇ and M. Robnik, Phys. Rev. E 106, 054203 (2022)], we perform an analysis of the features of mixed eigenstates in a time-dependent Hamiltonian system, the celebrated kicked top model. As a paradigmatic model for studying quantum chaos, the kicked top model is known to exhibit both classical and quantum chaos. The types of eigenstates are identified by means of the phase-space overlap index, which is defined as the overlap of the Husimi function with regular and chaotic regions in classical phase space. We show that the mixed eigenstates appear due to various tunneling precesses between different phase-space structures, while the regular and chaotic eigenstates are, respectively, associated with invariant tori and chaotic components in phase space. We examine how the probability distribution of the phase-space overlap index evolves with increasing system size for different kicking strengths. In particular, we find that the relative fraction of mixed states exhibits a power-law decay as the system size increases, indicating that only purely regular and chaotic eigenstates are left in the strict semiclassical limit. We thus provide further verification of the principle of uniform semiclassical condensation of Husimi functions and confirm the correctness of the Berry-Robnik picture.Source: Physical review. E. [Elektronski vir]. - ISSN 2470-0053 (Vol. 108, iss. 5, Nov. 2023, str. 1-9)Type of material - e-articlePublish date - 2023Language - englishCOBISS.SI-ID - 173702659
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Wang, Qian, matematik, fizik | 53155 |
Robnik, Marko, 1954- | 11337 |
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