Analytic eigenvalue structure of a coupled-oscillator system beyond the ground state
By analytically continuing the eigenvalue problem of a system of two coupled harmonic oscillators in the complex coupling constant g, we have found a continuation structure through which the conventional ground state of the decoupled system is connected to three other lower unconventional ground sta...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
20 July 2018
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| In: |
Physical review
Year: 2018, Jahrgang: 98, Heft: 1 |
| ISSN: | 2469-9934 |
| DOI: | 10.1103/PhysRevA.98.012127 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevA.98.012127 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.98.012127 
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| Verfasserangaben: | Alexander Felski and S.P. Klevansky |
MARC
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| 520 | |a By analytically continuing the eigenvalue problem of a system of two coupled harmonic oscillators in the complex coupling constant g, we have found a continuation structure through which the conventional ground state of the decoupled system is connected to three other lower unconventional ground states that describe the different combinations of the two constituent oscillators, taking all possible spectral phases of these oscillators into account [Bender et al., Phys. Scr. 92, 015201 (2017)]. In this work we calculate the connecting structures for the higher excitation states of the system and argue that, in contrast to the fourfold Riemann surface identified for the ground state, the general structure is eightfold instead. Furthermore we show that this structure in principle remains valid for equal oscillator frequencies as well and comment on the similarity of the connection structure to that of the single complex harmonic oscillator. | ||
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