State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, (P. R. China).
Angew Chem Int Ed Engl. 2014 Jan 13;53(3):729-33. doi: 10.1002/anie.201309416. Epub 2013 Dec 4.
There is an urgent need for the development in the field of the magnetism of topological insulators, owing to the necessity for the realization of the quantum anomalous Hall effect. Herein, we discuss experimentally fabricated nanostructured hierarchical architectures of the topological insulator Bi2Te3 without the introduction of any exotic magnetic dopants, in which intriguing room-temperature ferromagnetism was identified. First-principles calculations demonstrated that the intrinsic point defect with respect to the antisite Te site is responsible for the creation of a magnetic moment. Such a mechanism, which is different from that of a vacancy defect, provides new insights into the origins of magnetism. Our findings may pave the way for developing future Bi2Te3-based dissipationless spintronics and fault-tolerant quantum computation.
拓扑绝缘体的磁性领域迫切需要发展，这是因为需要实现量子反常霍尔效应。在此，我们讨论了实验制备的无任何奇异磁性掺杂的拓扑绝缘体 Bi2Te3 的纳米结构分级结构，其中鉴定出了有趣的室温铁磁性。第一性原理计算表明，相对于反位 Te 位的本征点缺陷负责产生磁矩。这种不同于空位缺陷的机制为磁性起源提供了新的见解。我们的发现可能为开发基于 Bi2Te3 的无耗散自旋电子学和容错量子计算铺平道路。
