A topological insulator is a state of quantum matter that, while being an insulator in the bulk, hosts topologically protected electronic states at the surface. These states open the opportunity to realize a number of new applications in spintronics and quantum computing. To take advantage of their peculiar properties, topological insulators should be tuned in such a way that ideal and isolated Dirac cones are located within the topological transport regime without any scattering channels. Here we report ab-initio calculations, spin-resolved photoemission and scanning tunnelling microscopy experiments that demonstrate that the conducting states can effectively tuned within the concept of a homologous series that is formed by the binary chalcogenides (Bi2Te3, Bi2Se3 and Sb2Te3), with the addition of a third element of the group IV.. ? 2011 Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
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机译:拓扑绝缘体是一种量子态,尽管它是整体中的绝缘体,但在表面上具有拓扑保护的电子态。这些州为实现自旋电子学和量子计算中的许多新应用提供了机会。为了利用其独特的性能,应对拓扑绝缘体进行调整,以使理想且隔离的狄拉克锥位于拓扑传输范围内而没有任何散射通道。在这里,我们报告了从头计算,自旋分辨光发射和扫描隧道显微镜实验,这些实验表明,导电态可以在由双硫族化物(Bi 2 sub> Te 3 sub>,Bi 2 sub> Se 3 sub>和Sb 2 sub> Te 3 sub>),添加第IV组的第三个元素。 2011年自然出版集团(Macmillan Publishers Limited的子公司)。版权所有。
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