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Electronic and magnetic properties in strongly correlated heterostructures

机译：强相关异质结构中的电子和磁性

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We present a theoretical study of a model heterostructure for a Mott insulator sandwiched between two band insulators, motivated by SrTiO_3/LaTiO_3. Particular emphasis is given on the interplay between magnetism and inhomogeneous charge distributions. Our mean-field analysis of the generalized Hubbard model displays numerous ordered phases in the ground-state phase diagram. In particular, we find a canted antiferromagnetic state near the interface when antiferromagnetic ordering exists inside the Mott insulator. A checkerboard charge ordering proposed previously is also stabilized for large long-range Coulomb interactions. Regarding its origin, we also point out the importance of interlayer spin-mediated interactions. It is further shown that such a strong spin-charge coupling gives rise to pronounced magnetic/charge-order phase transitions in external magnetic fields: a first-order metamagnetic transition and a reentrant charge-order transition with checkerboard pattern. The mechanisms stabilizing these intriguing phases are explored through a detailed analysis of the physical quantities with special focus on the spin-charge interplay.
机译：我们提出了由SrTiO_3 / LaTiO_3激发的，介于两个带状绝缘子之间的Mott绝缘子模型异质结构的理论研究。特别强调磁性和不均匀电荷分布之间的相互作用。我们对广义Hubbard模型的平均场分析在基态相图中显示了许多有序相。特别是，当Mott绝缘子内部存在反铁磁有序时，我们会在界面附近发现倾斜的反铁磁状态。对于大型远程库仑相互作用，先前提出的棋盘格电荷排序也很稳定。关于其起源，我们还指出了层间自旋介导的相互作用的重要性。进一步表明，这种强的自旋电荷耦合在外部磁场中引起明显的磁/电荷阶跃相：一阶亚磁跃迁和具有棋盘格图案的折返电荷阶跃。通过对物理量的详细分析，特别是在自旋电荷相互作用上，探索了稳定这些有趣阶段的机制。

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