Behavior of eigenvalues in a region of broken-PT symmetry
PT-symmetric quantum mechanics began with a study of the Hamiltonian $H=p^2+x^2(ix)^\varepsilon$. When $\varepsilon\geq0$, the eigenvalues of this non-Hermitian Hamiltonian are discrete, real, and positive. This portion of parameter space is known as the region of unbroken PT symmetry. In the region...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
2017
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| In: |
Arxiv
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| Online-Zugang: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1702.03811
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| Verfasserangaben: | Carl M. Bender, Nima Hassanpour, Daniel W. Hook, S.P. Klevansky, Christoph Sünderhauf, and Zichao Wen |
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| 520 | |a PT-symmetric quantum mechanics began with a study of the Hamiltonian $H=p^2+x^2(ix)^\varepsilon$. When $\varepsilon\geq0$, the eigenvalues of this non-Hermitian Hamiltonian are discrete, real, and positive. This portion of parameter space is known as the region of unbroken PT symmetry. In the region of broken PT symmetry $\varepsilon<0$ only a finite number of eigenvalues are real and the remaining eigenvalues appear as complex-conjugate pairs. The region of unbroken PT symmetry has been studied but the region of broken PT symmetry has thus far been unexplored. This paper presents a detailed numerical and analytical examination of the behavior of the eigenvalues for $-4<\varepsilon<0$. In particular, it reports the discovery of an infinite-order exceptional point at $\varepsilon=-1$, a transition from a discrete spectrum to a partially continuous spectrum at $\varepsilon=-2$, a transition at the Coulomb value $\varepsilon=-3$, and the behavior of the eigenvalues as $\varepsilon$ approaches the conformal limit $\varepsilon=-4$. | ||
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| 650 | 4 | |a High Energy Physics - Theory | |
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