A new strongly topological node-line semimetal beta-PbO2

作者：Wang, Zhenwei; Wang, Guangtao^*

来源：Physics Letters, Section A: General, Atomic and Solid State Physics , 2017, 381(34): 2856-2859.

DOI：10.1016/j.physleta.2017.06.041

• Topological node-line semimetal
• Dirac semimetal
• Weyl semimetal

By first-principles calculations, we find that PbO2 is a strongly topological node-line semimetal (NLSM), which is protected by the coexistence of the time-reversal and spatial inversion symmetry when the spin-orbit coupling (SOC) is ignored. In the three dimensions Brillouin zone, there are two node-line rings around the Gamma point, perpendicular to each other. It is different to the previously NLSM which has one or three node-line rings in the Brillouin zone. The drumhead-like surface states also can be obtained on both the (100) and (010) surfaces. When the SOC is included, a small gap opened along the nodal line, this material becomes a topological insulator. Therefore, our discovery renders an ideal platform for experimental exploration of the fundamental physics of topological node-line semimetals.

• 出版日期2017-9-12
• 单位河南师范大学