Abstract
In this paper we present the novel method for the generation of periodic embedded surfaces of nonpositive Gaussian curvature. The structures are related to the local minima of the scalar order parameter Landau-Ginzburg hamiltonan for microemulsions. The method is used to generate six unknown surfaces of Ia$\bar 3$d symmetry (gyroid) of genus 21, 53, 69, 109, 141 and 157 per unit cell. All of them but that of genus 21 are most likely the minimal surfaces. Schoen-Luzzati gyroid minimal surface of genus 5 (per unit cell) is also obtained.
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