论文标题
固有磁性绝缘体MNBI4TE7在电荷载体工程中，铁磁性和拓扑的共存7
Coexistence of Ferromagnetism and Topology by Charge Carrier Engineering in intrinsic magnetic topological insulator MnBi4Te7
论文作者
论文摘要
固有磁性拓扑绝缘子（MTIS）MNBI2TE4和MNBI2TE4/（BI2TE3）N有望实现高温量子异常霍尔效应（QAHE）和无耗散电气传输。在这一领域已经做出了广泛的努力，但仍然缺乏理想的MTI候选者，具有铁磁（FM）基态的磁性顺序。在这里，我们演示了MN的MT样品（BI0.7SB0.3）4TE7，该样本具有FM基态和拓扑非平常的共存。通过电荷载体工程工艺引起的磁性调制是通过AFM排序中的MNBI4TE7矩阵替换来引起的。 Mn（BI1-XSBX）4TE7中磁性的演变是通过磁测量和理论计算系统研究的。 X = 0.3的FM样品的清晰拓扑表面状态也通过角度分辨光发射光谱验证。我们还知道X = 0.3的FM样品接近电荷中性点。因此，在这项工作中，MN（BI0.7SB0.3）4TE7的内在FM-MTI的证明阐明了Qahe实现和优化的进一步研究。
Intrinsic magnetic topological insulators (MTIs) MnBi2Te4 and MnBi2Te4/(Bi2Te3)n are expected to realize the high-temperature quantum anomalous Hall effect (QAHE) and dissipationless electrical transport. Extensive efforts have been made on this field but there is still lack of ideal MTI candidate with magnetic ordering of ferromagnetic (FM) ground state. Here, we demonstrate a MTI sample of Mn(Bi0.7Sb0.3)4Te7 which holds the coexistence of FM ground state and topological non-triviality. The dramatic modulation of the magnetism is induced by a charge carrier engineering process by the way of Sb substitution in MnBi4Te7 matrix with AFM ordering. The evolution of magnetism in Mn(Bi1-xSbx)4Te7 is systematically investigated by magnetic measurements and theoretical calculations. The clear topological surface states of the FM sample of x = 0.3 are also verified by angle-resolved photoemission spectra. We also aware that the FM sample of x = 0.3 is close to the charge neutral point. Therefore, the demonstration of intrinsic FM-MTI of Mn(Bi0.7Sb0.3)4Te7 in this work sheds light to the further studies of QAHE realization and optimizations.
