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arXiv 1711.07976cond-mat.str-el
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3D拓扑近藤绝缘体

3D Topological Kondo Insulators

Soroush Arabi

摘要:

拓扑近藤绝缘体(TKI)是一种新型的受电子保护的拓扑绝缘体,它是在强关联和自旋轨道相互作用的共同作用下发展起来的。在这些材料中,由于近藤通过传导电子屏蔽局域化的时刻,体是一个完美的带绝缘体。此外,局域矩的强自旋轨道耦合(SOC)和晶体场效应(CFE)导致局域矩和导带之间的非局域奇宇称、时间反演不变的杂化,这产生具有非平凡拓扑和无间隙表面激发的基态(Physical Review Letters 104(2010)106408)。在目前的工作中,我们发展了一个自洽的理论来研究拓扑近藤绝缘体的平均场水平。为了实现这一点,我们应用从玻色子平均场论的系统,并没有周期性的边界条件,以研究系统在散装和平板几何配置。这使得我们能够通过能带结构和谱函数的计算观察到受保护边缘态的清晰特征。

英文摘要:

Topological Kondo insulators (TKIs) are new type of symmetry-protected topological insulators, which develop through the interplay of strong correlations and spin-orbit interactions. In these materials, the bulk is a perfect band insulator due to Kondo screening of localized moments via conduction electrons. Furthermore, strong spin-orbit coupling (SOC) and crystal field effect (CFE) of the localized moments result in a nonlocal odd-parity, time-reversal invariant hybridization between the local-moments and conduction bands, which creates a ground-state with nontrivial topology and gapless surface excitations (Physical Review Letters 104 (2010) 106408). In the present work, we develop a self-consistent theory to study topological Kondo insulators at the mean-field level. To achieve this, we apply slave-boson mean-field theory for a system with and without periodic boundary conditions, in order to study the system at bulk and slab geometry configuration. This enables us to observe a clear signature of protected edge states through band structure and calculation of spectral functions.

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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