Abstract
We investigate the parametric evolution of the real discrete spectrum of several complex PT symmetric scattering potentials of the type \(V(x)=-V_1 F_e(x) + i V_2 F_o(x), V_1>0, F_e(x)>0\) by varying \(V_2\) slowly. Here e, o stand for even and odd parity and \(F_{e,o}(\pm \infty )=0\). Unlike the case of Scarf II potential, we find a general absence of the recently explored accidental (real to real) crossings of eigenvalues in these scattering potentials. On the other hand, we find a general presence of coalescing of real pairs of eigenvalues at a finite number of exceptional points. After these points, real discrete eigenvalues become complex conjugate pairs. We attribute such coalescings of eigenvalues to the presence of a finite barrier (on the either side of \(x=0\)) which has been linked to a recent study of stokes phenomenon in the complex PT-symmetric potentials.
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Acknowledgments
Dona Ghosh wishes to thank Prof. Subenoy Chakraborty for his support and interest in this work.
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Ahmed, Z., Nathan, J.A., Sharma, D., Ghosh, D. (2016). Real Discrete Spectrum of Complex PT-Symmetric Scattering Potentials. In: Bagarello, F., Passante, R., Trapani, C. (eds) Non-Hermitian Hamiltonians in Quantum Physics. Springer Proceedings in Physics, vol 184. Springer, Cham. https://doi.org/10.1007/978-3-319-31356-6_1
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DOI: https://doi.org/10.1007/978-3-319-31356-6_1
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