Comment on "Eigenstate clustering around exceptional points"

• URL: http://arxiv.org/abs/2107.10674v1
• Date: Wed, 21 Jul 2021 13:08:10 GMT
• Title: Comment on "Eigenstate clustering around exceptional points"
• Authors: Francisco M. Fern\'andez
• Abstract summary: We show that the author of a recent paper put forward some false statements about the eigenstates of Hermitian and non-Hermitian systems. We conjecture that one of the non-Hermitian Hamiltonians for a one-dimensional lattice is similar to an Hermitian one and, consequently, exhibits real eigenvalues.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We show that the author of a recent paper [arXiv:2008.04929] put forward some false statements about the eigenstates of Hermitian and non-Hermitian systems. We conjecture that one of the non-Hermitian Hamiltonians for a one-dimensional lattice is similar to an Hermitian one and, consequently, exhibits real eigenvalues. Present theoretical analysis of the eigenvalue equation suggests that one of the sets of numerical results in the criticized paper may not be correct.

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