“…Before that, Wigner–von Neumann type functions can only create one L 2 solution [41]. Recently, there have been several important developments on the problem of embedded eigenvalues for Schrödinger operators, Laplacians on manifolds or other models [12, 14–17, 25, 27, 29–32, 34]. For perturbed Stark type operators, under the rational independence assumption of set , Naboko and Pushnitskii [36] constructed operators with given a set as embedded eigenvalues.…”