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【资源】《Nature》2009年8月27日出品内容
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《Nature》2009年8月27日出品内容 》》》》》》》》》》》》》》》》》》》》》 Topological surface states protected from backscattering by chiral spin texture Pedram Roushan1, Jungpil Seo1, Colin V. Parker1, Y. S. Hor2, D. Hsieh1, Dong Qian1, Anthony Richardella1,M. Z. Hasan1, R. J. Cava2& Ali Yazdani1 Topological insulators are a new class of insulators in which a bulk gap for electronic excitations is generated because of the strong spin–orbit coupling1–5 inherent to these systems. These materials are distinguished from ordinary insulators by the presence of gapless metallic surface states, resembling chiral edge modes in quantum Hall systems, but with unconventional spin textures. A key predicted feature of such spin-textured boundary states is their insensitivity to spin-independent scattering, which is thought to protect them from backscattering and localization. Recently, experimental and theoretical efforts have provided strong evidence for the existence of both two- and three-dimensional classes of such topological insulator materials in semiconductor quantum well structures6–8 and several bismuth-based compounds9–13 , but so far experiments have not probed the sensitivity of these chiral states to scattering. Here we use scanning tunnelling spectroscopy and angle-resolved photoemission spectroscopy to visualize the gapless surface states in the three-dimensional topological insulator Bi12xSbx, and examine in detail the influence of scattering from disorder caused by random alloying in this compound. We show that, despite strong atomic scale disorder, backscattering between states of opposite momentum and opposite spin is absent. Our observations demonstrate that the chiral nature of these states protects the spin of the carriers. These chiral states are therefore potentially useful for spin-based electronics, in which long spin coherence is critical 14 , and also for quantum computing applica- tions, where topological protection can enable fault-tolerant information processing15,16 .》》》》》》》》》》》》》》》》》》》 http://d.namipan.com/d/195ea6b24 ... b9eb010c58b19731601 http://d.namipan.com/d/195ea6b24 ... b9eb010c58b19731601 http://d.namipan.com/d/195ea6b24 ... b9eb010c58b19731601 下载测试正常顺畅，祝大家工作顺利。 http://d.namipan.com/d/195ea6b247792930183a4603ec468b9eb010c58b19731601 |
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2楼2009-08-27 21:35:03