共振下扩展哈伯德模型中的对过滤器
Pair Filters in an Extended Hubbard Model at Resonance
浏览论文内容
中文总结 AI 辅助
该研究在共振下的扩展哈伯德模型中，发现相邻双费米子对可作为过滤器，使单重态束缚对与单个费米子产生不同散射行为，为操控束缚对态提供动力学机制。
中文摘要 AI 辅助
我们研究共振下扩展哈伯德模型中束缚对的动力学。结果表明，单个费米子与单重态束缚对具有相同的色散关系，且会发生相互散射；而在强相互作用区域，相邻的双费米子对（doublon pair）会被动力学钉扎。值得注意的是，当遇到作为散射中心的钉扎双费米子对时，单个费米子与单重态束缚对表现出完全不同的散射行为：单重态束缚对会发生完美透射，而单个费米子则会被完全反射。这些结果表明，相邻双费米子对可作为一种高效的过滤器，将束缚对与单粒子分离，数值模拟完全支持该分析预测。本研究为生成和操控束缚对态提供了一种动力学机制。
英文摘要
We investigate the dynamics of bound pairs in an extended Hubbard model at resonance. We show that a single fermion and a singlet bound pair possess identical dispersion relations and scatter off each other. In contrast, a neighboring doublon pair is dynamically pinned in the strong-interaction regime. Remarkably, a single fermion and a singlet bound pair exhibit fundamentally different scattering behaviors when encountering a pinned doublon pair acting as a scattering center. While the singlet bound pair undergoes perfect transmission, the single fermion is completely reflected. These results demonstrate that a neighboring doublon pair functions as an efficient filter that separates bound pairs from single particles. Numerical simulations fully support the analytical predictions. Our findings provide a dynamical mechanism for generating and manipulating bound-pair states.
