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Nonlinear supersymmetry for non-Hermitian, non-diagonalizable Hamiltonians. I: General properties. (English) Zbl 1117.81070

Summary: We study complex potentials and related non-diagonalizable Hamiltonians with special emphasis on formal definitions of associated functions and Jordan cells. The non-linear SUSY for complex potentials is considered and the theorems characterizing its structure are presented. We define the class of complex potentials invariant under SUSY transformations for (non-)diagonalizable Hamiltonians and formulate several results concerning the properties of associated functions. We comment on the applicability of these results for softly non-Hermitian PT-symmetric Hamiltonians. The role of SUSY (Darboux) transformations in increasing/decreasing of Jordan cells in SUSY partner Hamiltonians is thoroughly analyzed and summarized in the Index Theorem. The properties of non-diagonalizable Hamiltonians as well as the Index Theorem are illustrated in the solvable examples of non-Hermitian reflectionless Hamiltonians. The rigorous proofs are relegated to part II of this paper. At last, some peculiarities in resolution of identity for discrete and continuous spectra with a zero-energy bound state at threshold are discussed. [For part II see the review below, the 3rd author, ibid., 773, No. 3, 137-171 (2007; Zbl 1117.81074)]

MSC:

81Q60 Supersymmetry and quantum mechanics
81Q10 Selfadjoint operator theory in quantum theory, including spectral analysis

Keywords:

Zbl 1117.81074

Citations:

Zbl 1117.81074
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