Rabi Oscillations of Strongly Driven Bose Polarons

Zeyu Liu; Pengfei Zhang

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arXiv · 2504.13688

Rabi Oscillations of Strongly Driven Bose Polarons

Zeyu Liu·Pengfei Zhang

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Abstract

Understanding the dynamical behavior of quasiparticles is essential for uncovering novel quantum many-body phenomena. Among these phenomena, the polaron in ultracold atomic gases has attracted considerable interest due to its precise controllability. By engineering the underlying Hamiltonian, polarons serve as a versatile platform for studying both equilibrium properties and non-equilibrium dynamics. In this work, we investigate the quantum dynamics of strongly driven Bose polarons, where minority atoms are described as mobile impurities with spin-1/2, and majority atoms are bosons. The spin-$\uparrow$ impurity interacts with majority atoms through a tunable scattering length $a$, while the spin-$\downarrow$ impurity remains non-interacting. After turning on the Rabi coupling, we calculate the evolution of the total magnetization using a trial wavefunction. We identify the exhibition of anomalous Rabi oscillation and steady-state magnetization for $a>0$, due to the interplay between attractive and repulsive polarons. Our results provide a concrete example that illustrates how Rabi oscillations are dressed by system-environment coupling.

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Zeyu Liu, Pengfei Zhang. 2025-04-18. Rabi Oscillations of Strongly Driven Bose Polarons. https://arxiv.org/abs/2504.13688

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