Extreme values of Hecke $L$-functions to angular characters

Let $K$ be an imaginary quadratic number field and let $L(s,ξ_{\ell})$ denote the Hecke $L$-function to an angular character $ξ_{\ell}$ with frequency $\ell$. We detect values of $\log |L(\tfrac12,ξ_{\ell})|$ with size at least $(\sqrt{2} + o_K(1))(\log X / \log \log X)^{1/2}$ along each dyadic range $X \leqslant \ell \leqslant 2X$. This result relies on the resonance method, which is applied for the first time to this family of $L$-functions, where the classification and extraction of diagonal terms depends on the geometry of the complex embedding of $K$.

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