单粒子态密度探测Fermi-哈伯德模型中动力学诱导的二重子排斥
Dynamically induced doublon repulsion in the Fermi-Hubbard model probed by a single-particle density of states
摘要：
我们研究了在非共振交流场的关联系统中，动态控制排斥束缚费米子（doublons）对之间相互作用的可能性。我们引入了一个有效的哈密顿量，描述的物理学的doublons到二阶的高频限制。结果表明，通过改变交流电场的功率，可以完全抑制平衡时的吸引力，然后将其转换为排斥力。我们表明，签名的动力学之间的排斥可以发现在单费米子的状态密度的时间平均。半满费米-哈伯德模型的非平衡动力学平均场论模拟进一步支持了我们的结果。
英文摘要：
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.
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