摘要
The topological properties of electronic bands have received significant attention since the 1980s,and recently one of the most important progress in condensed matter systems is the discovery of the topological insulator(TI)[1].It had been found that insulators can be classified by a topological invariant that takes different values for TI and ordinary insulators[1],and the topological invariant cannot be changed without closing the energy gap of the system.Therefore usually people believe the gapless system cannot have interesting topological features.
作者
Xiangang Wan
万贤纲(Ational Laboratory of Solid State Microstructures and School of Physics,Nanjing University,Nanjing 210093,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China)
基金
supported by the National Key R&D Program of China(2018YFA0305704)
the National Natural Science Foundation of China(11834006 and 12188101)
the support from the Tencent Foundation through the XPLORER PRIZE。
