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  • Letter
  • Open Access

Electron model on Truchet tiling: Extended-to-localized transitions and asymmetric spectrum

Junmo Jeon1,2,* and Shiro Sakai2,†

  • *Contact author: junmojeon@sophia.ac.jp
  • †Contact author: shirosakai@sophia.ac.jp
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Phys. Rev. B 112, L161104 – Published 1 October, 2025

DOI: https://doi.org/10.1103/qg97-s1vt

Abstract

Motivated by recent advances in the realization of Truchet-tiling structures in molecular networks and metal-organic frameworks, we investigate the wave localization issue in this kind of structure. We introduce an electron model based on random Truchet tilings, square lattices with randomly oriented diagonal links, and uncover a rich interplay between spectral and localization phenomena. By varying the strength of diagonal couplings, we explore successive transitions from an extended phase, through a regime with a mobility edge, to a fully localized phase. The energy-resolved fractal dimension analysis captures the emergence and disappearance of mobility edges, while an anomalous shift and asymmetry in the Van Hove singularity are identified as key signatures of the underlying disordered Truchet-tiling structure. Notably, by using the finite-size scaling of level spacing statistics, we clarify that the transition occurs at a finite level of disorder even in the two-dimensional system. Our findings position Truchet-tiled electron systems as a versatile platform for engineering disorder-driven localization and interaction effects in amorphous quantum materials and photonic architectures.

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Phys. Rev. B 112, L161104– Published 1 October, 2025
  • Received 6 May 2025
  • Revised 14 August 2025
  • Accepted 9 September 2025
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