School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201203, People's Republic of China.
Department of Physics, University of Oxford, Oxford OX1 3PU, UK.
Nat Commun. 2017 Jan 13;8:13973. doi: 10.1038/ncomms13973.
Topological Weyl semimetal (TWS), a new state of quantum matter, has sparked enormous research interest recently. Possessing unique Weyl fermions in the bulk and Fermi arcs on the surface, TWSs offer a rare platform for realizing many exotic physical phenomena. TWSs can be classified into type-I that respect Lorentz symmetry and type-II that do not. Here, we directly visualize the electronic structure of MoTe, a recently proposed type-II TWS. Using angle-resolved photoemission spectroscopy (ARPES), we unravel the unique surface Fermi arcs, in good agreement with our ab initio calculations that have nontrivial topological nature. Our work not only leads to new understandings of the unusual properties discovered in this family of compounds, but also allows for the further exploration of exotic properties and practical applications of type-II TWSs, as well as the interplay between superconductivity (MoTe was discovered to be superconducting recently) and their topological order.
拓扑 Weyl 半金属 (TWS)，一种新型的量子物质状态，最近引起了极大的研究兴趣。TWS 在体内具有独特的 Weyl 费米子，在表面具有费米弧，为实现许多奇异物理现象提供了难得的平台。TWS 可分为尊重洛伦兹对称的 I 型和不尊重洛伦兹对称的 II 型。在这里，我们直接可视化了最近提出的 II 型 TWS MoTe 的电子结构。使用角分辨光电子能谱 (ARPES)，我们揭示了独特的表面费米弧，与我们具有非平凡拓扑性质的第一性原理计算结果非常吻合。我们的工作不仅导致了对在这类化合物中发现的异常性质的新理解，而且还允许进一步探索 II 型 TWS 的奇异性质和实际应用，以及超导性 (MoTe 最近被发现是超导的)与其拓扑序之间的相互作用。
Zotero 插件
