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  • Letter
  • Open Access

Gaussian orthogonal ensemble for quasiperiodic tilings without unfolding: r-value statistics

Uwe Grimm*

Rudolf A. Römer†

  • School of Mathematics and Statistics, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom

  • Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom

  • *uwe.grimm@open.ac.uk
  • †r.roemer@warwick.ac.uk
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Phys. Rev. B 104, L060201 – Published 30 August, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L060201

Abstract

We study the level-spacing statistics for noninteracting Hamiltonians defined on the two-dimensional quasiperiodic Ammann-Beenker (AB) tiling. When applying the numerical procedure of “unfolding,” these spectral properties in each irreducible sector are known to be well described by the universal Gaussian orthogonal random matrix ensemble. However, the validity and numerical stability of the unfolding procedure has occasionally been questioned due to the fractal self-similarity in the density of states for such quasiperiodic systems. Here, using the so-called r-value statistics for random matrices, P(r), for which no unfolding is needed, we show that the Gaussian orthogonal ensemble again emerges as the most convincing level statistics for each irreducible sector. The results are extended to random-AB tilings where random flips of vertex connections lead to the irreducibility.

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Phys. Rev. B 104, L060201– Published 30 August, 2021
  • Received 20 July 2021
  • Accepted 12 August 2021
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