Lasing and counter-lasing phase transitions in a cavity QED system
| Autor: | Stitely, Kevin C., Giraldo, Andrus, Krauskopf, Bernd, Parkins, Scott |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Phys. Rev. Research 4, 023101 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.4.023101 |
| Popis: | We study the effect of spontaneous emission and incoherent atomic pumping on the nonlinear semiclassical dynamics of the unbalanced Dicke model -- a generalization of the Dicke model that features independent coupling strengths for the co- and counter-rotating interaction terms. As well as the ubiquitous superradiant behavior the Dicke model is well-known for, the addition of spontaneous emission combined with the presence of strong counter-rotating terms creates laser-like behavior termed counter-lasing. These states appear in the semiclassical model as stable periodic orbits. We perform a comprehensive dynamical analysis of the appearance of counter-lasing in the unbalanced Dicke model subject to strong cavity dissipation, such that the cavity field can be adiabatically eliminated to yield an effective Lipkin-Meshkov-Glick (LMG) model. If the coupling strength of the co-rotating interactions is small, then the counter-lasing phase appears via a Hopf bifurcation of the de-excited state. We find that if the rate of spontaneous emission is small, this can lead to resurgent superradiant pulses. However, if the co-rotating coupling is larger, then the counter-lasing phase must emerge via the steady-state superradiant phase. Such a transition is the result of the competition of the coherent and incoherent processes that drive superradiance and counter-lasing, respectively. We observe a surprisingly complex transition between the two, associated with the formation of a chaotic attractor over a thin transitional parameter region. Comment: 25 pages, 20 figures, 2 appendices |
| Databáze: | arXiv |
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