On the bound states of magnetic Laplacians on wedges
This paper is mainly inspired by the conjecture about the existence of bound states for magnetic Neumann Laplacians on planar wedges of any aperture $ϕ\in (0,π)$. So far, a proof was only obtained for apertures $ϕ\lesssim 0.511π$. The conviction in the validity of this conjecture for apertures $ϕ\gtrsim 0.511π$ mainly relied on numerical computations. In this paper we succeed to prove the existence of bound states for any aperture $ϕ\lesssim 0.583π$ using a variational argument with suitably chosen test functions. Employing some more involved test functions and combining a variational argument with computer-assistance, we extend this interval up to any aperture $ϕ\lesssim 0.595π$. Moreover, we analyse the same question for closely related problems concerning magnetic Robin Laplacians on wedges and for magnetic Schrödinger operators in the plane with $δ$-interactions supported on broken lines.