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Numerical Aspects of Eigenvalue and Eigenfunction Computations for Chaotic Quantum Systems

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The Mathematical Aspects of Quantum Maps

Part of the book series: Lecture Notes in Physics ((LNP,volume 618))

Abstract

We give an introduction to some of the numerical aspects in quantum chaos. The classical dynamics of two-dimensional area-preserving maps on the torus is illustrated using the standard map and a perturbed cat map. The quantization of area-preserving maps given by their generating function is discussed and for the computation of the eigenvalues a computer program in Python is presented. We illustrate the eigenvalue distribution for two types of perturbed cat maps, one leading to COE and the other to CUE statistics. For the eigenfunctions of quantum maps we study the distribution of the eigenvectors and compare them with the corresponding random matrix distributions. The Husimi representation allows for a direct comparison of the localization of the eigenstates in phase space with the corresponding classical structures. Examples for a perturbed cat map and the standard map with different parameters are shown.

Billiard systems and the corresponding quantum billiards are another important class of systems (which are also relevant to applications, for example in mesoscopic physics). We provide a detailed exposition of the boundary integral method, which is one important method to determine the eigenvalues and eigenfunctions of the Helmholtz equation. We discuss several methods to determine the eigenvalues from the Fredholm equation and illustrate them for the stadium billiard. The occurrence of spurious solutions is discussed in detail and illustrated for the circular billiard, the stadium billiard, and the annular sector billiard.

We emphasize the role of the normal derivative function to compute the normalization of eigenfunctions, momentum representations or autocorrelation functions in a very efficient and direct way. Some examples for these quantities are given and discussed.

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  1. Abteilung Theoretische Physik Universität Ulm, Albert-Einstein-Allee 11, D-89081, Ulm, Germany

    Arnd Bäcker

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  1. Arnd Bäcker
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  1. Dipartimento di Matematica, Università di Bologna, Piazza di Porta San Donato 5, 40127, Bologna, Italy

    Mirko Degli Esposti  & Sandro Graffi  & 

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Bäcker, A. (2003). Numerical Aspects of Eigenvalue and Eigenfunction Computations for Chaotic Quantum Systems. In: Esposti, M.D., Graffi, S. (eds) The Mathematical Aspects of Quantum Maps. Lecture Notes in Physics, vol 618. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-37045-5_4

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