论文标题
通过单粒子密度探测的Fermi-Hubbard模型中动态诱导的Doublon排斥
Dynamically induced doublon repulsion in the Fermi-Hubbard model probed by a single-particle density of states
论文作者
论文摘要
我们研究了在具有离子AC场的相关系统中，动态控制Fermions（Doubleons）对屈服对之间的相互作用的可能性。我们介绍了一种有效的哈密顿量，将Doubleon的物理学描述为高频极限。它揭示了在平衡方面具有吸引力的Doublon相互作用可以完全抑制，然后通过改变AC场的功率来切换为排斥。我们表明，双元之间动力排斥的特征可以在时间平均的单特米密度中找到。对于半填充的费米 - 哈伯德模型，非平衡动力学平均场理论模拟进一步支持了我们的结果。
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 the 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.
