Publication: Pseudo-Hermiticity versus PT-symmetry. II. A complete characterization of non-Hermitian Hamiltonians with a real spectrum
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Abstract
We give a necessary and sufficient condition for the reality of the spectrum of a non-Hermitian Hamiltonian admitting a complete set of biorthonormal eigenvectors.
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American Institute of Physics (AIP) Publishing
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Journal of Mathematical Physics
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10.1063/1.1461427