Observation of Zeeman effect in topological surface state with distinct material dependence.
Observation of Zeeman effect in topological surface state with distinct material dependence.
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具有明显材料依赖性的拓扑表面态塞曼效应的观察
DOI：
10.1038/ncomms10829
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发表时间：
2016-02-24
影响因子：
16.6
通讯作者：
Sasagawa T
中科院分区：
文献类型：
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作者：
Fu YS;Hanaguri T;Igarashi K;Kawamura M;Bahramy MS;Sasagawa T
操纵拓扑表面态的自旋是探索由磁掺杂或外磁场引起的时间反转对称性破缺所产生的奇异量子态的重要一步。后一种情况依赖于塞曼效应，因此我们需要精确地估计拓扑表面态的g因子。在这里，我们报告了用光谱成像扫描隧道显微镜直接观察到Bi2Se3和Sb2Te2Se表面的塞曼效应。通过适当地排除拓扑表面态频带色散非线性和空间变化电位引起的外在影响，可以明确地识别零模朗道能级的塞曼位移。令人惊讶的是，Bi2Se3和Sb2Te2Se的拓扑表面态的g因子是非常不同的（分别为+18和- 6）。这种显著的材料依赖性为控制拓扑表面态的自旋开辟了一条新的途径。电子在磁场下的行为为奇异量子态提供了固有的信息。在这里，Fu等人发现了Bi2Se3和Sb2Te2Se中拓扑表面态的不同g因子，这表明在自旋相关应用中可能控制这些状态。
Manipulating the spins of the topological surface states represents an essential step towards exploring the exotic quantum states emerging from the time reversal symmetry breaking via magnetic doping or external magnetic fields. The latter case relies on the Zeeman effect and thereby we need to estimate the g-factor of the topological surface state precisely. Here, we report the direct observations of the Zeeman effect at the surfaces of Bi2Se3 and Sb2Te2Se by spectroscopic-imaging scanning tunnelling microscopy. The Zeeman shift of the zero mode Landau level is identified unambiguously by appropriately excluding the extrinsic effects arising from the nonlinearity in the band dispersion of the topological surface state and the spatially varying potential. Surprisingly, the g-factors of the topological surface states in Bi2Se3 and Sb2Te2Se are very different (+18 and −6, respectively). Such remarkable material dependence opens up a new route to control the spins of the topological surface states. The knowledge of how electrons behave under magnetic field provides inherent information for exotic quantum states. Here, Fu et al. find different g-factors of topological surface states in Bi2Se3 and Sb2Te2Se, which suggests possible control of such states in spin-related applications.