Browsing by Author "Aguilera-Valdes, E."

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    Photon-assisted tunneling resonantly extending the domain of the PT-symmetric phase
    (2023) Morales-Molina, L.; Aguilera-Valdes, E.
    We theoretically study the photon-assisted tunneling (PAT) in a PT- symmetric triple-well potential (TWP) with balanced gain-loss between the noncentral wells and neutral central well. We show that the application of an ac drive in the central well permits to control the Rabi frequency of the population oscillation between the noncentral wells of the TWP. In particular, when a multiple of the driving frequency matches the chemical potential in the central well, an enhancement of the Rabi frequency is observed. Very importantly, we show that PAT resonantly extends the domain of the parameter space with a real spectrum. This is achieved for a gain-loss parameter well above its critical value in the nondriven case, which allows for stable Rabi oscillations in a strong gain-loss scenario. Moreover, within a Floquet framework, we find an analytical estimation of the critical gain-loss parameter for the different resonance values of the driving frequency. We also discuss possible physical realizations of our model.