Kim Se Kwon, Tserkovnyak Yaroslav
Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
Phys Rev Lett. 2017 Aug 18;119(7):077204. doi: 10.1103/PhysRevLett.119.077204. Epub 2017 Aug 17.
Motivated by a recent experimental demonstration of a chiral edge mode in an array of spinning gyroscopes, we theoretically study the coupled gyration modes of topological magnetic solitons, vortices and magnetic bubbles, arranged as a honeycomb lattice. The soliton lattice under suitable conditions is shown to support a chiral edge mode like its mechanical analogue, the existence of which can be understood by mapping the system to the Haldane model for an electronic system. The direction of the chiral edge mode is associated with the topological charge of the constituent solitons, which can be manipulated by an external field or by an electric-current pulse. The direction can also be controlled by distorting the honeycomb lattice. Our results indicate that the lattices of magnetic solitons can serve as reprogrammable topological metamaterials.
受近期在一系列旋转陀螺仪中手性边缘模式的实验演示的启发，我们从理论上研究了排列成蜂窝晶格的拓扑磁孤子、涡旋和磁泡的耦合回转模式。结果表明，在适当条件下，孤子晶格像其机械类似物一样支持手性边缘模式，通过将该系统映射到电子系统的霍尔丹模型可以理解其存在。手性边缘模式的方向与组成孤子的拓扑电荷相关，可通过外部场或电流脉冲进行操纵。该方向也可以通过扭曲蜂窝晶格来控制。我们的结果表明，磁孤子晶格可以用作可重新编程的拓扑超材料。
