arXiv:1706.02687 [quant-ph]AbstractReferencesReviewsResources
A generalization of the quantum Rabi model: exact solution and spectral structure
Hans-Peter Eckle, Henrik Johannesson
Published 2017-06-08Version 1
We consider a generalization of the quantum Rabi model where the two-level system and the single-mode cavity oscillator are coupled by an additional Stark-like term. By adapting a method recently introduced by Braak [Phys. Rev. Lett. {\bf 107}, 100401 (2011)], we solve the model exactly. The low-lying spectrum in the experimentally relevant ultrastrong and deep strong regimes of the Rabi coupling is found to exhibit two striking features absent from the original quantum Rabi model: avoided level crossings for states of the same parity and an anomalously rapid onset of two-fold near-degenerate levels as the Rabi coupling increases.
Comments: 25 pages, 6 figures, to appear in J. Phys. A: Math.Theor
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