论文标题
拓扑绝缘子BI $ _2 $ _2 $ se $ _3 $从Surface Bi $ _ \ RM {SE} $ Antisite缺陷
Spontaneous ferromagnetism and finite surface energy gap in the topological insulator Bi$_2$Se$_3$ from surface Bi$_\rm{Se}$ antisite defects
论文作者
论文摘要
我们对BI $ _ \ MATHRM {SE} $ ANTISITE缺陷执行Ab-Initio计算，在Bi $ _2 $ SE $ _3 $的表面上，发现具有自发的铁磁性的强烈低能量缺陷共鸣，该共鸣固定在由于出色的大型磁性磁性磁性的磁性磁性磁性能量的情况下固定在平面方向上。对于表面层中的反岩缺陷，我们发现半度性的铁磁性和与狄拉克表面状态的强杂交，从而产生有限的能量隙。对于更深层的缺陷，这种杂交在很大程度上没有，磁矩变得更加局部，并且不存在能量差距。
We perform ab-initio calculations on Bi$_\mathrm{Se}$ antisite defects in the surface of Bi$_2$Se$_3$, finding strong low-energy defect resonances with a spontaneous ferromagnetism, fixed to an out-of-plane orientation due to an exceptional large magnetic anisotropy energy. For antisite defects in the surface layer, we find semi-itinerant ferromagnetism and strong hybridization with the Dirac surface state, generating a finite energy gap. For deeper lying defects, such hybridization is largely absent, the magnetic moments becomes more localized, and no energy gap is present.
