论文标题
掺杂的量子抗铁磁铁中的主要五阶相关性
Dominant fifth-order correlations in doped quantum anti-ferromagnets
论文作者
论文摘要
传统上,一个和两点相关函数用于表征多体系统。在密切相关的量子材料(例如掺杂的2D费米 - 哈伯德系统)中,这些材料可能不再足够了,因为高阶相关性对于理解多体系统的特征至关重要,并且在数值上可以主导。在实验上,在超低原子系统中,这种高阶相关性最近已访问。在这里,我们揭示了掺杂的量子抗铁磁铁中强烈的非高斯相关性,并表明高阶相关性在低阶项上占主导地位。我们使用DMRG研究了$ T-J $模型中的一个移动孔,并揭示了与掺杂剂的移动性直接相关的真正五阶相关性。我们使用基于掺杂的量子自旋液体的模型将结果与预测进行了对比,这些模型具有显着降低的高阶相关性。我们的预测可以在2D费米 - 哈伯德模型的量子模拟器中以当前可访问的温度最低进行测试。最后,我们建议在实验中研究相同的五阶自旋荷兰相关性与掺杂的函数。这将有助于在哈伯德模型的最争论的制度中揭示电荷载体的微观性质,这与理解高$ T_C $超导性有关。
Traditionally one and two-point correlation functions are used to characterize many-body systems. In strongly correlated quantum materials, such as the doped 2D Fermi-Hubbard system, these may no longer be sufficient because higher-order correlations are crucial to understanding the character of the many-body system and can be numerically dominant. Experimentally, such higher-order correlations have recently become accessible in ultracold atom systems. Here we reveal strong non-Gaussian correlations in doped quantum anti-ferromagnets and show that higher order correlations dominate over lower-order terms. We study a single mobile hole in the $t-J$ model using DMRG, and reveal genuine fifth-order correlations which are directly related to the mobility of the dopant. We contrast our results to predictions using models based on doped quantum spin liquids which feature significantly reduced higher-order correlations. Our predictions can be tested at the lowest currently accessible temperatures in quantum simulators of the 2D Fermi-Hubbard model. Finally, we propose to experimentally study the same fifth-order spin-charge correlations as a function of doping. This will help to reveal the microscopic nature of charge carriers in the most debated regime of the Hubbard model, relevant for understanding high-$T_c$ superconductivity.