Engineering Ponderomotive Potential for Realizing $\pi$ and $\pi/2$ Bosonic Josephson Junctions

Jiadu Lin; Qing-Dong Jiang

doi:10.1016/j.aop.2025.170247

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arXiv · 2411.06619

Engineering Ponderomotive Potential for Realizing $\pi$ and $\pi/2$ Bosonic Josephson Junctions

Jiadu Lin·Qing-Dong Jiang

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Abstract

We study the ponderomotive potential of a bosonic Josephson junction periodically modulated by a high-frequency electromagnetic field. Within the small population difference approximation, the ponderomotive drive induces the well-known Kapitza pendulum effect, stabilizing a $\pi$-phase mode. We discuss the parameter dependence of the dynamical transition from macroscopic quantum self-trapping to $\pi$-Josephson oscillations. Furthermore, we examine the situation where the small population difference approximation fails. In this case, an essential momentum-shortening effect emerges, leading to a stabilized $\pi/2$-phase mode under certain conditions. By mapping this to a classical pendulum scenario, we highlight the uniqueness and limitations of the $\pi/2$-phase mode in bosonic Josephson junctions.

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Jiadu Lin, Qing-Dong Jiang. 2024-11-10. Engineering Ponderomotive Potential for Realizing $\pi$ and $\pi/2$ Bosonic Josephson Junctions. https://doi.org/10.1016/j.aop.2025.170247

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