Massive Dirac Fermion at the Surface of the van der Waals Antiferromagnet MnBi$_2$Te$_4$
Massive Dirac Fermion at the Surface of the van der Waals Antiferromagnet MnBi$_2$Te$_4$
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DOI：
10.1103/physrevb.100.121104
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
R. C. Vidal;H. Bentmann;T. Peixoto;A. Zeugner;S. Moser;C. Min;S. Schatz;K. Kißner;M. Unzelmann;C. Fornari;H. B. Vasili;M. Valvidares;K. Sakamoto;J. Fujii;I. Vobornik;T. Kim;R. Koch;C. Jozwiak;A. Bostwick;J. Denlinger;E. Rotenberg;J. Buck;M. Hoesch;F. Diekmann;S. Rohlf;M. Kallane;K. Rossnagel;M. Otrokov;E. Chulkov;M. Ruck;A. Isaeva;F. Reinert
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文献类型：
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作者：
R. C. Vidal;H. Bentmann;T. Peixoto;A. Zeugner;S. Moser;C. Min;S. Schatz;K. Kißner;M. Unzelmann;C. Fornari;H. B. Vasili;M. Valvidares;K. Sakamoto;J. Fujii;I. Vobornik;T. Kim;R. Koch;C. Jozwiak;A. Bostwick;J. Denlinger;E. Rotenberg;J. Buck;M. Hoesch;F. Diekmann;S. Rohlf;M. Kallane;K. Rossnagel;M. Otrokov;E. Chulkov;M. Ruck;A. Isaeva;F. Reinert
层状范德华化合物MnBi$_2$Te$_4$被预测将典型拓扑绝缘体Bi$_2$Te$_3$的带有序与Mn的磁性结合起来，使该材料成为实现各种磁性拓扑状态的可行候选材料。采用角分辨光电子能谱（ARPES）实验系统地研究了MnBi$_2$Te$_4$（0001）单晶的表面电子结构。结合光子能量依赖和自旋分辨测量，我们在MnBi$_2$Te$_4$（0001）表面建立了一个大质量的狄拉克费米子，在低温反铁磁相和顺磁相都存在。我们的实验结果证实了MnBi$_2$Te$_4$中拓扑表面态和磁序的共存。
The layered van der Waals compound MnBi$_2$Te$_4$ has been predicted to combine the band ordering of archetypical topological insulators like Bi$_2$Te$_3$ with the magnetism of Mn, making this material a viable candidate for the realization of various magnetic topological states. We have systematically investigated the surface electronic structure of MnBi$_2$Te$_4$(0001) single crystals by use of angle-resolved photoelectron spectroscopy (ARPES) experiments. Combining photon-energy-dependent and spin-resolved measurements we establish the presence of a single massive Dirac fermion at the MnBi$_2$Te$_4$(0001) surface, both, in the low-temperature antiferromagnetic phase and in the paramagnetic phase. Our experimental results establish the coexistence of a topological surface state and magnetic order in MnBi$_2$Te$_4$.