Angle-resolved photoemission spectroscopy study on the surface states of the correlated topological insulator YbB6.
Angle-resolved photoemission spectroscopy study on the surface states of the correlated topological insulator YbB6.
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相关拓扑绝缘体YbB6表面态的角分辨光电发射光谱研究
DOI：
10.1038/srep05999
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发表时间：
2014-08-08
影响因子：
4.6
通讯作者：
Feng DL
中科院分区：
文献类型：
--
作者：
Xia M;Jiang J;Ye ZR;Wang YH;Zhang Y;Chen SD;Niu XH;Xu DF;Chen F;Chen XH;Xie BP;Zhang T;Feng DL
最近预测YbB6是一种适度相关的拓扑绝缘体，这为探索相关性和拓扑性质之间的相互作用提供了一个平台。与角分辨光电子能谱，我们直接观察到几乎线性色散带周围的时间反演不变的动量和可忽略不计的kz的依赖性，与奇数的表面状态交叉的费米能级在Z2拓扑绝缘体。圆二色性光电子能谱表明，这些在间隙状态具有手性的轨道角动量，这是相关的手征自旋纹理，进一步表明其拓扑性质。观察到的绝缘间隙的YbB6是约100 meV，大于理论计算发现。我们的研究结果提供了强有力的证据，YbB6是一个相关的拓扑绝缘体，并提供了基础，为进一步研究这种有前途的材料。
YbB6 is recently predicted to be a moderately correlated topological insulator, which provides a playground to explore the interplay between correlation and topological properties. With angle-resolved photoemission spectroscopy, we directly observed almost linearly dispersive bands around the time-reversal invariant momenta and with negligible kz dependence, consistent with odd number of surface states crossing the Fermi level in a Z2 topological insulator. Circular dichroism photoemission spectra suggest that these in-gap states possess chirality of orbital angular momentum, which is related to the chiral spin texture, further indicative of their topological nature. The observed insulating gap of YbB6 is about 100 meV, larger than that found by theoretical calculations. Our results present strong evidence that YbB6 is a correlated topological insulator and provide a foundation for further studies of this promising material.
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影响因子：
56.9
作者：
Bernevig, B. Andrei;Hughes, Taylor L.;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
56.9
作者：
Koenig, Markus;Wiedmann, Steffen;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
8.6
作者：
Scholz, M. R.;Sanchez-Barriga, J.;Rader, O.
通讯作者：
Rader, O.
影响因子：
5.4
作者：
FISK, Z;SCHMIDT, PH;LONGINOTTI, LD
通讯作者：
LONGINOTTI, LD
影响因子：
1.8
作者：
Kato, Y.;Arai, H.;Yoshimoto, M.
通讯作者：
Yoshimoto, M.