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arXiv 2407.04413cond-mat.mtrl-sci
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拓扑绝缘体中的高通量磁性共掺杂与交换相互作用设计

High-throughput magnetic co-doping and design of exchange interactions in a topological insulator

Rubel Mozumder, Johannes Wasmer, David Antognini Silva, Stefan Blügel, Philipp Rüßmann

AI总结:

本文通过高通量从头算模拟系统研究了Bi$_2$Te$_3$中过渡金属单杂质和二聚体的磁性与交换耦合,揭示化学趋势并提出共掺杂策略以调控磁性拓扑绝缘体的磁基态。

摘要:

利用从头算杂质嵌入模拟的高通量自动化,我们创建了一个数据库,其中包含嵌入原型拓扑绝缘体(TI)Bi$_2$Te$_3$ 中的 $3d$ 和 $4d$ 过渡金属缺陷。我们模拟了单一杂质以及 TI 内部不同杂质-杂质距离下的杂质二聚体。我们提取了磁矩的变化,分析了非磁性杂质原子通过邻近磁性杂质原子的极化率,并计算了海森堡哈密顿量的交换耦合常数。我们揭示了交换耦合常数中的化学趋势,并讨论了杂质在量子反常霍尔绝缘体和拓扑量子计算领域中关于磁序的潜力。特别是,我们预测不同磁性掺杂剂的共掺杂是设计磁性 TI 中磁基态的一种可行策略。

英文摘要:

Using high-throughput automation of ab-initio impurity embedding simulations, we created a database of $3d$ and $4d$ transition metal defects embedded into the prototypical topological insulator (TI) Bi$_2$Te$_3$. We simulate both single impurities as well as impurity dimers at different impurity-impurity distances inside the TI. We extract changes to magnetic moments, analyze the polarizability of non-magnetic impurity atoms via nearby magnetic impurity atoms and calculate the exchange coupling constants for a Heisenberg Hamiltonian. We uncover chemical trends in the exchange coupling constants and discuss the impurities' potential with respect to magnetic order in the fields of quantum anomalous Hall insulators and topological quantum computing. In particular, we predict that co-doping of different magnetic dopants is a viable strategy to engineer the magnetic ground state in magnetic TIs.

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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