Physics – Condensed Matter
Scientific paper
1999-03-03
Physics
Condensed Matter
5 Revtex pages, 5 EPS figures, accepted for publication in PRL
Scientific paper
We study quantum chaos in a non-KAM system, i.e. a kicked particle in a one-dimensional infinite square potential well. Within the perturbative regime the classical phase space displays stochastic web structures, and the diffusion coefficient D in the regime increases with the perturbative strength K giving a scaling $D \propto K^{2.5}$, and in the large K regime D goes as K^2. Quantum mechanically, we observe that the level spacing statistics of the quasi eigenenergies changes from Poisson to Wigner distribution as the kick strength increases. The quasi eigenstates show power-law localization in the small K region, which become extended one at large K. Possible experimental realization of this model is also discussed.
Gu Yan
Hu Beilai
Li Baowen
Liu Jie
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