Abstract
We investigate the equidistribution of the eigenfunctions on quantum graphs in the high-energy limit. Our main result is an estimate of the deviations from equidistribution for large well-connected graphs. We use an exact field-theoretic expression in terms of a variant of the supersymmetric nonlinear σ model. Our estimate is based on a saddle-point analysis of this expression and leads to a criterion for when equidistribution emerges asymptotically in the limit of large graphs. Our theory predicts a rate of convergence that is a significant refinement of previous estimates, long assumed to be valid for quantum chaotic systems, agreeing with them in some situations but not all. We discuss specific examples for which the theory is tested numerically.
Translated title of the contribution | Quantum ergodicity on graphs |
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Original language | English |
Pages (from-to) | 264102 - 264105 |
Number of pages | 7 |
Journal | Physical Review Letters |
Volume | 101, issue 26 |
DOIs | |
Publication status | Published - Dec 2008 |