Spectral Statistics for the Dirac Operator on Graphs

Details Spectral Statistics for the Dirac Operator on Graphs Spectral Statistics for the Dirac Operator on Graphs

2002-10-15

arxiv.org/abs/nlin/0210029v1

J. Phys. A: Math. Gen. 36 (2003) 2747-2769

Nonlinear Sciences

Chaotic Dynamics

Scientific paper

10.1088/0305-4470/36/11/307

We determine conditions for the quantisation of graphs using the Dirac operator for both two and four component spinors. According to the Bohigas-Giannoni-Schmit conjecture for such systems with time-reversal symmetry the energy level statistics are expected, in the semiclassical limit, to correspond to those of random matrices from the Gaussian symplectic ensemble. This is confirmed by numerical investigation. The scattering matrix used to formulate the quantisation condition is found to be independent of the type of spinor. We derive an exact trace formula for the spectrum and use this to investigate the form factor in the diagonal approximation.

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