论文标题
拓扑自旋 - 流浪波
Topological spin-plasma waves
论文作者
论文摘要
拓扑绝缘子的表面托有带有自旋摩托锁定的狄拉克电子状态，这限制了垂直于电子动量的旋转方向。结果，相互作用的狄拉克液体中的集体等离子体激发表现为耦合电荷和自旋波。在这里，我们证明了自旋成分的存在可以在拓扑绝缘子表面和绝缘磁铁表面之间的等离子波和自旋波之间有效耦合。此外，自旋旋转纹理的螺旋性质提供了自旋波和等离子体波之间耦合的相位绕组，这使杂交自旋 - 超脱模式的光谱在拓扑上是非平凡的。我们还表明，这种拓扑模式导致了大厅的大响应。
The surface of a topological insulator hosts Dirac electronic states with the spin-momentum locking, which constrains spin orientation perpendicular to electron momentum. As a result, collective plasma excitations in the interacting Dirac liquid manifest themselves as coupled charge- and spin-waves. Here we demonstrate that the presence of the spin component enables effective coupling between plasma waves and spin waves at interfaces between the surface of a topological insulator and insulating magnet. Moreover, the helical nature of spin-momentum locking textures provides the phase winding in the coupling between the spin and plasma waves that makes the spectrum of hybridized spin-plasma modes to be topologically nontrivial. We also show that such topological modes lead to a large thermal Hall response.
