the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XD30000000);the National Key R&D Program of China(Grant Nos.2018YFA0305802 and 2017YFA0303500);the National Natural Science Foundation of China(Grant No.11774267).Calculations were performed at the supercomputing center of WHU of China.
High-order nonlinear multiphoton absorption is usually inefficient,but can be enhanced by designing resonant excitations between occupied and unoccupied energy levels.We conducted angle-resolved multi-photon photoemis...
Three-dimensional (3D) topological insulators represent a new state of quantum matter with a bulk gap and odd number of relativistic Dirac fermions on the surface. The unusual surface states of topological insulator...
Acknowledgements We would like to thank the collaborations with Shanyu Liu, Xiaowen Jia, Junfeng He, Yingying Peng, Li Yu, Xu Liu, Guodong Liu, Shaolong He, Xiaoli Dong, Jun Zhang, Hangdong Wang, Chiheng Dong, Minghu Fang, J. B. He, D. M. Wang, G. F. Chert, J. G. Guo, X. L. Chen, Xiaoyang Wang, Qinjun Peng, Zhimin Wang, Shenjin Zhang, Feng Yang, Zuyan Xu, and Chuangtian Chen. This work was financially supported by the National Natural Science Foundation of China (Grant No. 10734120) and the State Key Development Program for Basic Research of China (973 program, Grant No. 2011CB921703).
The latest discovery of a new iron-chalcogenide superconductor AXFe2-ySe2 (A =K, Cs, Rb, and Tl, etc.) has attracted much attention due to a number of its unique characteristics, such as the possible insulating stat...