论文标题
在应变和Zeeman场下对SR2IRO4中的多纤维效应进行建模
Modeling multiorbital effects in Sr2IrO4 under strain and a Zeeman field
论文作者
论文摘要
我们介绍了适用于层次iRAIDE SR2IRO4的三轨晶格模型的全面研究。我们的分析包括各种现场相互作用（包括Hubbard和Hund's）以及压缩应变以及Zeeman磁场。我们使用具有多个阶参数的自洽平均场方法来表征所得阶段。虽然在某些参数状态中，该化合物通过有效的J = 1/2模型很好地描述了化合物，在其他方向上，需要完整的多纤维描述。作为压缩应变的函数，我们发现了两个量子相变的两个量子相变：首先是连续的金属 - 绝缘体跃迁，然后是抗磁磁序的一阶磁熔融。至关重要的是，j = 1/2和j = 3/2的频带在这些过渡中起着重要作用。我们的结果定性地与底物诱导的菌株下的SR2IRO4实验一致，并激发了较高菌株的研究。
We present a comprehensive study of a three-orbital lattice model suitable for the layered iridate Sr2IrO4. Our analysis includes various on-site interactions (including Hubbard and Hund's) as well as compressive strain, and a Zeeman magnetic field. We use a self-consistent mean field approach with multiple order parameters to characterize the resulting phases. While in some parameter regimes the compound is well described by an effective J=1/2 model, in other regimes the full multiorbital description is needed. As a function of the compressive strain, we uncover two quantum phase transitions: first a continuous metal-insulator transition, and subsequently a first order magnetic melting of the antiferromagnetic order. Crucially, bands of both J=1/2 and J=3/2 nature play important roles in these transitions. Our results qualitatively agree with experiments of Sr2IrO4 under strain induced by a substrate, and motivate the study of higher strains.
