标题：Mn induced ferromagnetism and modulated topological surface states in Bi_(2)Te_(3)
作者：Chengwang Niu;Ying Dai;Meng Guo;Wei Wei;Yandong Ma;Baibiao Huang
作者机构：School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People\'s Republic of China;Scho
来源：Applied physics letters
摘要：The ferromagnetism and topological surface states manipulated by manganese in topological insulator Bi_(2)Te_(3) are investigated by means of first-principles calculations. Our results indicate that substitution Mn for Bi can induce spin-polarized hole states with a total magnetic moments of 4.0 (mu)_(B), and sufficient hole carrier density is required to obtain sustained magnetization. The obvious gap at the Dirac point coinciding with sharp surface state appears as Mn doped into Bi_(2)Te_(3) because the magnetic interactions break the time reversal symmetry. The study paves a way to explore topological magnetoelectric effect and spintronic device applications.