arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.4460cond-mat.str-elcond-mat.mtrl-sci
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三维拓扑相的关联效应:从体相到边界相

Correlation effects on 3D topological phases: from bulk to boundary

Ara Go, William Witczak-Krempa, Gun Sang Jeon, Kwon Park, Yong Baek Kim

摘要:

量子物质的拓扑相不受传统序参量的表征,但可以表现出量子化的电磁响应和/或受保护的表面态。我们研究这种现象的三维相关的复杂氧化物,烧绿石铱酸盐的模型。该模型实现了具有和不具有时间反演对称性的相互作用拓扑绝缘体以及拓扑Weyl半金属。我们使用细胞动力学平均场论,一种方法,结合量子多体效应,并允许我们评估相关系统中的磁电拓扑响应系数。这个不变量是用来解开一个简单的平均场研究中缺乏的相互作用的轴子绝缘体的存在。我们证实了我们的散装结果通过研究的拓扑边界状态的相互作用的存在下的演变。实验结果和搜索相关材料的保护拓扑秩序。

英文摘要:

Topological phases of quantum matter defy characterization by conventional order parameters but can exhibit quantized electro-magnetic response and/or protected surface states. We examine such phenomena in a model for three-dimensional correlated complex oxides, the pyrochlore iridates. The model realizes interacting topological insulators with and without time-reversal symmetry, and topological Weyl semimetals. We use cellular dynamical mean field theory, a method that incorporates quantum-many-body effects and allows us to evaluate the magneto-electric topological response coefficient in correlated systems. This invariant is used to unravel the presence of an interacting axion insulator absent within a simple mean field study. We corroborate our bulk results by studying the evolution of the topological boundary states in the presence of interactions. Consequences for experiments and for the search for correlated materials with symmetry-protected topological order are given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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