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

• URL: http://arxiv.org/abs/2411.06619v2
• Date: Mon, 25 Nov 2024 09:22:39 GMT
• Title: Engineering Ponderomotive Potential for Realizing $π$ and $π/2$ Bosonic Josephson Junctions
• Authors: Jiadu Lin, Qing-Dong Jiang,
• Abstract summary: We study the ponderomotive potential of a bosonic Josephson junction periodically by a high-frequency electromagnetic field. We discuss the parameter dependence of the dynamical transition from macroscopic quantum self-trapping to $pi$-Josephson oscillations.
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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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