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Critical parameters for non-hermitian Hamiltonians
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math-phmath.MP
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criticalhamiltoniansmodelsnon-hermitianparametersaccurateappearancecalculate
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We calculate accurate critical parameters for a class of non-hermitian Hamiltonians by means of the diagonalization method. We study three one-dimensional models and two perturbed rigid rotors with PT symmetry. One of the latter models illustrates the necessity of a more general condition for the appearance of real eigenvalues that we also discuss here.
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