论文标题
$η$ - 水上基础状态
$η$-pairing ground states in the non-Hermitian Hubbard model
论文作者
论文摘要
非热性的引入极大地丰富了传统凝结物理学的研究领域，并最终导致了一系列异国现象的发现。我们研究了非铁人假想跳动对有吸引力的哈伯德模型的影响。确切的结合对溶液表明，电子 - 电子相关性抑制了非热性，从而导致偏离分子的长距离顺序（ODLRO）基态。在较大的负$ U $限制中，ODLRO基态对应于$η$ -Spin铁磁状态。我们还通过混合跳跃配置研究了系统。数值结果表明，通过提高假想的跳高强度，存在从正常到$η$ pairing的基础状态的过渡。我们的结果为非炎症强度相关的系统提供了一种有希望的方法。
The introduction of non-Hermiticity has greatly enriched the research field of traditional condensed matter physics, and eventually led to a series of discoveries of exotic phenomena. We investigate the effect of non-Hermitian imaginary hoppings on the attractive Hubbard model. The exact bound-pair solution shows that the electron-electron correlation suppresses the non-Hermiticity, resulting in off-diagonal long-range order (ODLRO) ground state. In a large negative $U $ limit, the ODLRO ground state corresponds to $η$-spin ferromagnetic states. We also study the system with mixed hopping configuration. The numerical result indicates the existence of the transition from normal to $η$-pairing ground states by increasing the imaginary hopping strength. Our results provide a promising approach for the non-Hermitian strongly correlated system.
