期刊
PHYSICAL REVIEW A
卷 80, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.80.052107
关键词
eigenvalues and eigenfunctions; P invariance; quantum theory; T invariance; tight-binding calculations
We study the non-Hermitian quantum mechanics for the discrete system. This paper gives an exact analytic single-particle solution for an N-site tight-binding chain with two conjugated imaginary potentials +/- i gamma at two end sites, which Hamiltonian has parity-time symmetry (PT symmetry). Based on the Bethe ansatz results, it is found that, in single-particle subspace, this model is comprised of two phases: an unbroken symmetry phase with a purely real energy spectrum in the region gamma gamma(c). The behaviors of eigenfunctions and eigenvalues in the vicinity of gamma(c) are investigated. It is shown that the boundary of two phases possesses the characteristics of exceptional point. We also construct the equivalent Hermitian Hamiltonian of the present model in the framework of metric-operator theory. We find out that the equivalent Hermitian Hamiltonian can be written as another bipartite lattice model with real long-range hoppings.
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