We investigate the possibility to control dynamically the interactions between repulsively bound pairs of fermions (doublons) in correlated systems with off-resonant ac fields. We introduce an effective Hamiltonian that describes the physics of doublons up to second order in the high-frequency limit. It unveils that the doublon interaction, which is attractive in equilibrium, can be completely suppressed and then switched to repulsive by varying the power of the ac field. We show that the signature of the dynamical repulsion between doublons can be found in the single-fermion density of states averaged in time. Our results are further supported by nonequilibrium dynamical mean-field theory simulations for the half-filled Fermi-Hubbard model.

中文翻译：

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通过单粒子态密度探测费米-哈伯德模型中的动态诱导的杜布排斥

我们研究了动态地控制与非共振交流场相关的系统中的排斥力对的费米子（双倍子）之间相互作用的可能性。我们介绍了一种有效的哈密顿量，该哈密顿量描述了在高频极限内达二阶的双链体的物理性质。它揭示了平衡中具有吸引力的双链相互作用可以被完全抑制，然后通过改变交流场的功率而变为排斥性。我们表明，可以在时间上平均的状态的单费米子密度中发现双子之间的动态排斥的特征。半填充费米-哈伯德模型的非平衡动力学平均场理论仿真进一步支持了我们的结果。