Eigenvalue estimates for non-selfadjoint dirac operators on the real line by Jean-Claude Cuenin, Ari Laptev, Christiane Tretter

“…We show that the non-embedded eigenvalues of the Dirac operator on the real line with complex mass and non-Hermitian potential V lie in the disjoint union of two disks, provided that the L 1-norm of V is bounded from above by the speed of light times the reduced Planck constant. …”
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