Asymptotically vanishing PT −symmetric potentials and negative-mass Schrödinger equations
نویسندگان
چکیده
In paper I [M. Znojil and G. Lévai, Phys. Lett. A 271 (2000) 327] we introduced the Coulomb Kratzer bound-state problem in its cryptohermitian, PT −symmetric version. An instability of the original model is revealed here. A necessary stabilization is achieved, for almost all couplings, by an unusual, negative choice of the bare mass in Schrödiner equation.
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