Topological electronic structures in metallic phases

Abstract：Following the discovery of 2D and 3D topological insulators, in the past few years, topological electronic structures in metallic phases were discovered and actively investigated, such as the topological Dirac/Weyl semimetals and topological line-node semimetals. These new topological phases can host interesting exotic particles and unusual physical phenomena (such as Weyl fermions, surface Fermi-arcs, negative magnetoresistance, chiral magnetic effects and topological superconductivity, etc.) which are not only interesting in fundamental physics, but also attractive to novel future applications. In this talk, I will discuss how to identify the nontrivial bulk and surface topological electronic structures in these interesting metallic phases by angel resolved photoemission spectroscopy (i.e. ARPES) [1]. Furthermore, I will also briefly introduce the recently advances of ARPES (with spatial, spin and time resolution) which can be used in the future investigations on topological electronic structures, even along the edges and in the interfaces of materials. [1] Science, 343, 864 (2014), Nat. Mater., 13, 677 (2014), Nat. Phys., 11, 728 (2015), Nat. Mater., 15, 27(2016), Nat. Commun. 7, 12924 (2016), Nat Commun. 8, 13973 (2017). Nat. Commun. 9, 56 (2018), Science, 362, 65 (2018), Nat. Rev. Mater., 3, 341 (2018), Nat Commun, 10, 3478 (2019), Nat. Phys. 15, 759 (2019)