Chen Y L, Analytis J G, Chu J-H, Liu Z K, Mo S-K, Qi X L, Zhang H J, Lu D H, Dai X, Fang Z, Zhang S C, Fisher I R, Hussain Z, Shen Z-X
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
Science. 2009 Jul 10;325(5937):178-81. doi: 10.1126/science.1173034. Epub 2009 Jun 11.
Three-dimensional topological insulators are a new state of quantum matter with a bulk gap and odd number of relativistic Dirac fermions on the surface. By investigating the surface state of Bi2Te3 with angle-resolved photoemission spectroscopy, we demonstrate that the surface state consists of a single nondegenerate Dirac cone. Furthermore, with appropriate hole doping, the Fermi level can be tuned to intersect only the surface states, indicating a full energy gap for the bulk states. Our results establish that Bi2Te3 is a simple model system for the three-dimensional topological insulator with a single Dirac cone on the surface. The large bulk gap of Bi2Te3 also points to promising potential for high-temperature spintronics applications.
三维拓扑绝缘体是一种新的量子物质状态，具有体能隙且表面存在奇数个相对论性狄拉克费米子。通过角分辨光电子能谱研究Bi2Te3的表面态，我们证明其表面态由单个非简并狄拉克锥构成。此外，通过适当的空穴掺杂，费米能级可被调节至仅与表面态相交，这表明体态存在完全能隙。我们的结果表明，Bi2Te3是具有表面单个狄拉克锥的三维拓扑绝缘体的一个简单模型体系。Bi2Te3的大体能隙也表明其在高温自旋电子学应用方面具有广阔的潜在前景。
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