Weierstrass semigroups at every point of the Suzuki curve

Abstract

In this article we explicitly determine the structure of the Weierstrass semigroups $H(P)$ for any point $P$ of the Suzuki curve ${\mathcal{S}}_q$. As the point $P$ varies, exactly two possibilities arise for $H(P)$: one for the ${\mathbb{F}}_q$-rational points (already known in the literature), and one for all remaining points. For this last case a minimal set of generators of $H(P)$ is also provided. As an application, we construct dual one-point codes from an $\mathbb{F}_{q^4}\setminus\fq$-point whose parameters are better in some cases than the ones constructed in a similar way from an $\fq$-rational point.