Octagonal tilings with three prototiles

Abstract

Motivated by theoretically and experimentally observed structural phases with octagonal symmetry, we introduce a family of octagonal tilings which are composed of three prototiles. We define our tilings with respect to two non-negative integers, $m$ and $n$, so that the inflation factor of a given tiling is $\delta_{(m,n)}=m+n (1+\sqrt{2})$. As such, we show that our family consists of an infinite series of tilings which can be delineated into separate `cases' which are determined by the relationship between $m$ and $n$. Similarly, we present the primitive substitution rules or decomposition of our prototiles, along with the statistical properties of each case, demonstrating their dependence on these integers.