2014/02/28 by R. Dubertrand, Ignacio García-Mata, I. García-Mata +8 · 1 citation
Mathematics · Physics and Astronomy · #Ergodic theory #Fractal #Mathematical analysis #Mathematics #Multifractal system #Perturbation (astronomy) #Physics #Quantum #Quantum and electron transport phenomena #Quantum chaos and dynamical systems #Quantum many-body systems #Quantum mechanics #Statistical physics #Theoretical physics #cond-mat.dis-nn #nlin.CD #quant-ph
paper · pdf · doi:10.1103/physrevlett.112.234101
published as Phys. Rev. Lett. 112, 234101 (2014) · 5 pages, 4 figures, minor modifications, published version
openalex publication_date 2014/06/10 · arxiv created 2014/06/13 · arxiv updated 2014/06/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We expose two scenarios for the breakdown of quantum multifractality under the effect of perturbations. In the first scenario, multifractality survives below a certain scale of the quantum fluctuations. In the other one, the fluctuations of the wave functions are changed at every scale and each multifractal dimension smoothly goes to the ergodic value. We use as generic examples a one-dimensional dynamical system and the three-dimensional Anderson model at the metal-insulator transition. Based on our results, we conjecture that the sensitivity of quantum multifractality to perturbation is universal in the sense that it follows one of these two scenarios depending on the perturbation. We also discuss the experimental implications.