纯Sb和拓扑绝缘体BiSb中拓扑保护Dirac自旋织构和πBerry相的观测
Observation of topologically protected Dirac spin-textures and πBerry's phase in pure Antimony (Sb) and topological insulator BiSb
摘要：
拓扑有序材料的特征在于罕见的电子量子组织，其回避了传统的基于自发破缺对称性的凝聚态物质分类。奇异的自旋输运现象，如无耗散的量子自旋霍尔效应已被推测源于一种新的拓扑秩序，其识别需要自旋敏感的测量。使用自旋分辨ARPES，我们探测自旋自由度，并证明拓扑量子数是唯一确定的自旋纹理Berry相位成像测量。将此方法应用于纯锑和铋锑合金，我们确定了其新颖的拓扑序和镜像陈数负值的起源。这些结果一起构成了第一次观察到的表面电子集体携带拓扑Berry的相位和明确的镜像Chern手征在纯锑（Sb），这是实现拓扑量子计算通过接口Majorana费米子框架的关键电子特性。本文包含上述先前报道的（Science \textbf{323}，919（2009））结果的详细信息。
英文摘要：
A topologically ordered material is characterized by a rare quantum organization of electrons that evades the conventional spontaneously broken symmetry based classification of condensed matter. Exotic spin transport phenomena such as the dissipationless quantum spin Hall effect have been speculated to originate from a novel topological order whose identification requires a spin sensitive measurement. Using Spin-resolved-ARPES, we probe the spin degrees of freedom and demonstrate that topological quantum numbers are uniquely determined from spin-texture Berry Phase imaging measurements. Applying this method to pure antimony (Sb) and Bi-Sb, we identify the origin of its novel Topological Order and the negative value of the mirror Chern number. These results taken together constitute the first observation of surface electrons collectively carrying a topological Berry's phase and definite mirror Chern chirality in pure Antimony (Sb) which are the key electronic properties for realizing topological quantum computing via the interface Majorana fermion framework. This paper contains the details of the above mentioned previously reported (Science \textbf{323}, 919 (2009)) results.
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