Erratum: Crossover of the three-dimensional topological insulator Bi 2 Se 3 to the two-dimensional limit (Nature Physics (2010) 6 (584-588))
Erratum: Crossover of the three-dimensional topological insulator Bi 2 Se 3 to the two-dimensional limit (Nature Physics (2010) 6 (584-588))
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DOI：
10.1038/nphys1779
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发表时间：
2010-09
期刊：
影响因子：
19.6
通讯作者：
Yi Zhang;K. He;Cui-Zu Chang;C. Song;Lili Wang;Xi Chen;J. Jia;Z. Fang;X. Dai;Wen-Yu Shan-We
中科院分区：
文献类型：
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作者：
Yi Zhang;K. He;Cui-Zu Chang;C. Song;Lili Wang;Xi Chen;J. Jia;Z. Fang;X. Dai;Wen-Yu Shan-We
拓扑绝缘体，，，是一种新的量子物质状态，其特征是体模中有有限的能隙，并且沿着边界流动的无隙模式对无序散射具有很强的健壮性。表面态的拓扑保护对低功率电子学和容错量子计算都是有用的。对于三维拓扑绝缘体薄板，来自相反表面的边界模可以通过量子隧道耦合，从而打开一个与厚度有关的小间隙。本文报道了用分子束外延生长的不同厚度的Bi2Se3薄膜的角度分辨光电子能谱结果。当厚度小于六个五元层时，能隙开口清晰可见。由于衬底感生电势的差异，带隙表面态还表现出相当大的Rashba型自旋轨道分裂。可调间隙和自旋轨道耦合使这些拓扑薄膜成为电子和自旋电子器件应用的理想选择。
A topological insulator,,,,,,,,is a new state of quantum matter that is characterized by a finite energy gap in the bulk and gapless modes flowing along the boundaries that are robust against disorder scattering. The topological protection of the surface state could be useful for both low-power electronics and error-tolerant quantum computing,. For a thin slab of three-dimensional topological insulator, the boundary modes from the opposite surfaces may be coupled by quantum tunnelling, so that a small, thickness-dependent gap is opened up,,. Here we report such results from angle-resolved photoemission spectroscopy on Bi2Se3films of various thicknesses grown by molecular beam epitaxy. The energy gap opening is clearly seen when the thickness is below six quintuple layers. The gapped surface states also exhibit sizeable Rashba-type spin–orbit splitting because of the substrate-induced potential difference between the two surfaces. The tunable gap and the spin–orbit coupling make these topological thin films ideal for electronic and spintronic device applications.