2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/145243We construct an exactly solvable PT-symmetric example of Sturmian bound states which exist in the absence of any confining potential. Their origin is purely topological -- these states live on certain nontrivial contours of complex coordinates.16 pp incl 3 figuresQuantum Physicstext