Complex Square Well --- A New Exactly Solvable Quantum Mechanical Model

Details Complex Square Well --- A New Exactly Solvable Quantum Mechanical Model Complex Square Well --- A New Exactly Solvable Quantum Mechanical Model

1999-06-16

arxiv.org/abs/quant-ph/9906057v1

J.Phys.A32:6771-6781,1999

Physics

Quantum Physics

7 pages, Revtex, 2 eps-figures enclosed

Scientific paper

10.1088/0305-4470/32/39/305

Recently, a class of PT-invariant quantum mechanical models described by the non-Hermitian Hamiltonian $H=p^2+x^2(ix)^\epsilon$ was studied. It was found that the energy levels for this theory are real for all $\epsilon\geq0$. Here, the limit as $\epsilon\to\infty$ is examined. It is shown that in this limit, the theory becomes exactly solvable. A generalization of this Hamiltonian, $H=p^2+x^{2M}(ix)^\epsilon$ (M=1,2,3,...) is also studied, and this PT-symmetric Hamiltonian becomes exactly solvable in the large-\epsilon limit as well. In effect, what is obtained in each case is a complex analog of the Hamiltonian for the square well potential. Expansions about the large-\epsilon limit are obtained.

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