Observation of possible topological in-gap surface states in the Kondo insulator SmB6 by photoemission.

Observation of possible topological in-gap surface states in the Kondo insulator SmB6 by photoemission.
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通过光电发射观察近藤绝缘体 SmB6 中可能的拓扑带隙表面态

DOI:
10.1038/ncomms4010
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发表时间:
2013
影响因子:
16.6
通讯作者:
Feng, D. L.
Feng, D. L.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Jiang, J.;Li, S.;Zhang, T.;Sun, Z.;Chen, F.;Ye, Z. R.;Xu, M.;Ge, Q. Q.;Tan, S. Y.;Niu, X. H.;Xia, M.;Xie, B. P.;Li, Y. F.;Chen, X. H.;Wen, H. H.;Feng, D. L.

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SmB6是一种著名的近藤绝缘体,在低温下表现出输运异常。这种异常通常归因于杂化间隙内的状态。最近的理论工作和输运测量表明,这些间隙状态可以归因于拓扑表面态,这将使SmB 6拓扑近藤绝缘体的第一个实现。在这里,通过进行角分辨光电子能谱实验,我们直接观察到几个分散状态内的SmB6的杂化间隙。这些状态显示出可忽略的kz依赖性,这表明它们的表面起源。此外,我们进行了光电子圆二色性实验,这表明在间隙状态具有手性的轨道角动量。在150 K左右,这些态与杂化能隙同时消失。总之,这些观察结果表明,可能的拓扑起源的间隙状态。
SmB6, a well-known Kondo insulator, exhibits a transport anomaly at low temperature. This anomaly is usually attributed to states within the hybridization gap. Recent theoretical work and transport measurements suggest that these in-gap states could be ascribed to topological surface states, which would make SmB6 the first realization of topological Kondo insulator. Here by performing angle-resolved photoemission spectroscopy experiments, we directly observe several dispersive states within the hybridization gap of SmB6. These states show negligible kz dependence, which indicates their surface origin. Furthermore, we perform photoemission circular dichroism experiments, which suggest that the in-gap states possess chirality of the orbital angular momentum. These states vanish simultaneously with the hybridization gap at around 150 K. Together, these observations suggest the possible topological origin of the in-gap states.
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