论文标题
调查与rashba杂质的拓扑结膜绝缘子的表面状态
Investigation of Surface State of Topological Kondo Insulator with Rashba Impurities
论文作者
论文摘要
我们通过在奴隶玻色子协议的框架内执行平均场理论计算来研究通用拓扑围栏绝缘体系统。我们假设局部电子之间的无限哈伯德型相互作用。绝缘子的块状金属和绝缘阶段之间的差异是最近邻居跳跃局部电子的迹象。跳高幅度对金属呈阳性，对于绝缘阶段是阳性的。然而，表面金属性以及散装绝缘层需要非常强的F电子定位。此外，我们发现，由于系统表面上存在磁杂质而产生的交换场在表面状态的无间隙狄拉克分散体上张开一个空隙。对于间隙的表面状态频谱，我们发现频带内和频段间非常规等离子体的可能性。散装金属性的至高无上，在Rashba杂质的存在下，包括螺旋液体的绝缘体表面是当前通信的重要结果。对无间隙dirac光谱的访问导致带有通常的波矢量依赖性q^1/2的旋转等离子体。 RASHBA耦合不会损害近野筛选，也不会影响大块的量子临界点。
We study a generic topological Kondo insulator system by performing a mean-field theoretic calculation within the frame-work of slave-boson protocol. We assume infinite Hubbard-type interaction among the localized electrons. The difference between the bulk metallic and insulating phases of the insulator is in the sign of nearest neighbor hopping of localized electrons. The hopping amplitude is positive for the metallic and negative for the insulating phase. The surface metallicity together with bulk insulation, however, requires very strong f electron localization. Furthermore, we find that the exchange field, arising due to the presence of the magnetic impurities on the surface of the system, opens a gap at the gapless Dirac dispersion of the surface states. For the gapped surface state spectrum, we find the possibility of intra-band as well as inter-band unconventional plasmons. The paramountcy of the bulk metallicity, and, in the presence of the Rashba impurities, the insulator surface comprising of helical liquids are the important outcomes of the present communication. The access to the gapless Dirac spectrum leads to spin plasmons with the usual wave vector dependence q^1/2. The Rashba coupling does not impair the Kondo screening and does not affect the quantum critical point for the bulk.
