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Title: Semi-Poisson statistics in quantum chaos
Authors: García-García, A.M.
Wang, J. 
Issue Date: 2006
Citation: García-García, A.M., Wang, J. (2006). Semi-Poisson statistics in quantum chaos. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 73 (3) : -. ScholarBank@NUS Repository.
Abstract: We investigate the quantum properties of a nonrandom Hamiltonian with a steplike singularity. It is shown that the eigenfunctions are multifractals and, in a certain range of parameters, the level statistics is described exactly by semi-Poisson statistics (SP) typical of pseudointegrable systems. It is also shown that our results are universal, namely, they depend exclusively on the presence of the steplike singularity and are not modified by smooth perturbations of the potential or the addition of a magnetic flux. Although the quantum properties of our system are similar to those of a disordered conductor at the Anderson transition, we report important quantitative differences in both the level statistics and the multifractal dimensions controlling the transition. Finally, the study of quantum transport properties suggests that the classical singularity induces quantum anomalous diffusion. We discuss how these findings may be experimentally corroborated by using ultracold atoms techniques. © 2006 The American Physical Society.
Source Title: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
ISSN: 15393755
DOI: 10.1103/PhysRevE.73.036210
Appears in Collections:Staff Publications

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