Topological magnetic insulators with corundum structure |
| |
Authors: | Wang Jing Li Rundong Zhang Shou-Cheng Qi Xiao-Liang |
| |
Institution: | Department of Physics, Tsinghua University, Beijing 100084, China. |
| |
Abstract: | Topological insulators are new states of quantum matter in which surface states residing in the bulk insulating gap are protected by time-reversal symmetry. When a proper kind of antiferromagnetic long-range order is established in a topological insulator, the system supports axionic excitations. In this Letter, we study theoretically the electronic states in a transition metal oxide of corundum structure, in which both spin-orbit interaction and electron-electron interaction play crucial roles. A tight-binding model analysis predicts that materials with this structure can be strong topological insulators. Because of the electron correlation, an antiferromagnetic order may develop, giving rise to a topological magnetic insulator phase with axionic excitations. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|