论文标题
反铁磁体中的非平衡孔动力学：抑制弦和极性
Nonequilibrium Hole Dynamics in Antiferromagnets: Damped Strings and Polarons
论文作者
论文摘要
如$ t $ - $ j $型号所述，我们开发了一种针对抗铁磁旋转晶格中孔动力学的非扰动理论。这是通过概括为非平衡系统的自以为是的诞生近似来实现的，从而可以计算全日制依赖的多体波函数。我们的方法揭示了三个不同的动力学机制，最终导致磁极的形成。遵循孔动力学的初始弹道阶段，弦激发的连贯形成会导致孔密度的特征振荡。它们的阻尼最终留下了磁性极性，从而大大降低了弹道运动。开发的理论提供了一个严格的框架，用于了解量子磁体中缺陷的非平衡物理，并定量解释了强耦合方案中冷原子量子模拟的最新观察结果。
We develop a nonperturbative theory for hole dynamics in antiferromagnetic spin lattices, as described by the $t$-$J$ model. This is achieved by generalizing the selfconsistent Born approximation to nonequilibrium systems, making it possible to calculate the full time-dependent many-body wave function. Our approach reveals three distinct dynamical regimes, ultimately leading to the formation of magnetic polarons. Following the initial ballistic stage of the hole dynamics, coherent formation of string excitations gives rise to characteristic oscillations in the hole density. Their damping eventually leaves behind magnetic polarons that undergo ballistic motion with a greatly reduced velocity. The developed theory provides a rigorous framework for understanding nonequilibrium physics of defects in quantum magnets and quantitatively explains recent observations from cold-atom quantum simulations in the strong coupling regime.
