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arXiv 1601.01740cond-mat.mes-hallcond-mat.mtrl-sci
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具有明显材料依赖性的拓扑表面态中塞曼效应的观测

Observation of Zeeman effect in topological surface state with distinct material dependence

Ying-Shuang Fu, T. Hanaguri, K. Igarashi, M. Kawamura, M. S. Bahramy, T. Sasagawa

摘要:

拓扑绝缘体表面的螺旋狄拉克费米子是固体中新的相对论量子现象。操纵拓扑表面态(TSS)的自旋是探索通过磁场或磁场破缺时间反演对称性(TRS)的理论预言的奇异态的重要一步。理解TSS的塞曼效应并确定其g因子对于后一种形式的TRS破缺中的此类操作至关重要。在这里,我们报告这些直接的实验观察Bi 2Se 3和Sb 2 Te 2Se的光谱成像扫描隧道显微镜。零模朗道能级的塞曼位移通过明智地排除与TSS带色散和空间变化势中的非线性相关的外在影响而明确地确定。在Bi_2Se_3和Sb_2 Te_2Se中,TSS的g因子分别为18和-6。这种显著的材料依赖性为控制TSS中的自旋开辟了新的途径。

英文摘要:

The helical Dirac fermions on the surface of topological insulators host novel relativistic quantum phenomena in solids. Manipulating spins of topological surface state (TSS) represents an essential step towards exploring the theoretically predicted exotic states related to time reversal symmetry (TRS) breaking via magnetism or magnetic field. Understanding Zeeman effect of TSS and determining its g-factor are pivotal for such manipulations in the latter form of TRS breaking. Here, we report those direct experimental observations in Bi2Se3 and Sb2Te2Se by spectroscopic imaging scanning tunneling microscopy. The Zeeman shifting of zero mode Landau level is identified unambiguously by judiciously excluding the extrinsic influences associated with the non-linearity in the TSS band dispersion and the spatially varying potential. The g-factors of TSS in Bi2Se3 and Sb2Te2Se are determined to be 18 and -6, respectively. This remarkable material dependence opens a new route to control the spins in the TSS.

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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