English

PT-symmetric potentials with imaginary asymptotic saturation

Quantum Physics 2020-05-25 v2 Mathematical Physics math.MP Optics

Abstract

We point out that PT-symmetric potentials VPT(x)V_{PT}(x) having imaginary asymptotic saturation: VPT(x=±)=±iV1,V1V_{PT}(x=\pm \infty) =\pm i V_1, V_1 \in \Re are devoid of scattering states and spectral singularity. We show the existence of real (positive and negative) discrete spectrum both with and without complex conjugate pair(s) of eigenvalues (CCPEs). If the states are arranged in the ascending order or real part of discrete eigenvalues, the initial states have few nodes but latter ones oscillate fast. Both real and imaginary parts of ψ(x)\psi(x) vanish asymptotically, ψ(x)|\psi(x)| for the CCPEs are asymmetric and for real energies these are symmetric about origin. For CCPEs E±E_{\pm} the eigenstates ψ±\psi_{\pm} follow an interesting property that ψ+(x)=Nψ(x),N+|\psi_+(x)|= N |\psi_-(-x)|, N \in \Re^+. We remark that, the fast oscillating real discrete energy states discussed are likely to be confused with: reflectionless states, one dimensional version of von Neumann states of Hermitian and spectral singularity state of complex PT-symmetric potentials.

Keywords

Cite

@article{arxiv.1808.05828,
  title  = {PT-symmetric potentials with imaginary asymptotic saturation},
  author = {Zafar Ahmed and Sachin Kumar},
  journal= {arXiv preprint arXiv:1808.05828},
  year   = {2020}
}

Comments

Six figures and 11 pages, A MAJOR REVISION

R2 v1 2026-06-23T03:36:45.175Z