论文标题
Moiré量子点阵列的磁性特性
Magnetic properties of moiré quantum dot arrays
论文作者
论文摘要
我们研究了Moiré三角形超晶格的量子点阵列的磁性特性。从互惠空间模型开始，我们使用投影技术来获得最大局部的Wannier函数并确定广义Hubbard模型参数。多体哈密顿量使用精确的对角线化方法求解，这是不同形状的量子点阵列中电子数量的函数。在大多数研究的结构中，在各种填充因子中观察到有限的自旋极化，并且在大多数研究结构中都有足够的强相互作用。提出了通过应用位移场控制磁化的前景。在半填充附近，可以看到Moiré材料中Nagaoka Ferromagnetism的特征，我们通过将结果与相应的现场Hubbard模型进行比较来证明。
We investigate magnetic properties of quantum dot arrays of moiré triangular superlattices. Starting from a reciprocal space model, we use the projection technique to obtain maximally localized Wannier functions and determine generalized Hubbard model parameters. The many-body Hamiltonian is solved using the exact diagonalization method as a function of the number of electrons in differently shaped quantum dots arrays. Finite spin polarization is observed within a wide range of filling factors for small twist angles and sufficiently strong interactions in most of the studied structures. The prospect for a magnetization controlled by applying a displacement field is presented. In the vicinity of half-filling, signatures of Nagaoka ferromagnetism in moiré materials are seen, which we demonstrate by comparing results with the corresponding on-site Hubbard model.
