| 查看: 566 | 回复: 1 | ||
| 【奖励】 本帖被评价1次，作者zjys5887增加金币 1 个 | ||
| 当前主题已经存档。 | ||
[资源]
【资源】《Nature》2009年8月27日出品内容
|
||
|
《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 |
回复此楼» 猜你喜欢
体制内长辈说体制内绝大部分一辈子在底层，如同你们一样大部分普通教师忙且收入低
已经有10人回复
-
过年走亲戚时感受到了所开私家车的鄙视链
已经有9人回复
-
今年春晚有几个节目很不错，点赞！
已经有10人回复
-
情人节自我反思：在爱情中有过遗憾吗？
已经有10人回复
-
基金正文30页指的是报告正文还是整个申请书
已经有5人回复
2楼2009-08-27 21:35:03