Experimental Realization of a Three-Dimensional Dirac Semimetal
Experimental Realization of a Three-Dimensional Dirac Semimetal
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DOI：
10.1103/physrevlett.113.027603
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发表时间：
2014-07-08
影响因子：
8.6
通讯作者：
Cava, Robert J.
中科院分区：
文献类型：
--
作者：
Borisenko, Sergey;Gibson, Quinn;Cava, Robert J.
我们通过角度分辨光发射光谱法报告了三维（3D）DIRAC半学相（CD3AS2）中的直接观察。我们确定了两个动量区域，在这些区域中，在各个方向上强烈分散的电子状态形成狭窄的结构，从而证明了长期寻求的3D DIRAC点的存在。这种电子结构自然解释了为什么CD3AS2具有最高的散装电子迁移率之一。 CD3AS2中3D Dirac半学的实现不仅为广泛的应用开辟了直接路径，而且还为工程上拓扑的非平凡阶段提供了强大的平台，包括Weyl Semimetals和Quantum Spin Hall Systems。
We report the direct observation of the three-dimensional (3D) Dirac semimetal phase in cadmium arsenide (Cd3As2) by means of angle-resolved photoemission spectroscopy. We identify two momentum regions where electronic states that strongly disperse in all directions form narrow conelike structures, and thus prove the existence of the long sought 3D Dirac points. This electronic structure naturally explains why Cd3As2 has one of the highest known bulk electron mobilities. This realization of a 3D Dirac semimetal in Cd3As2 not only opens a direct path to a wide spectrum of applications, but also offers a robust platform for engineering topologically nontrivial phases including Weyl semimetals and quantum spin Hall systems.