标题： 可调谐多磁振子弗洛凯拓扑边缘态 显示英文标题

标题： Tunable multi-magnon Floquet topological edge states

摘要： 我们表明，在二维磁子绝缘体中周期性地调制Dzyaloshinskii-Moriya相互作用（DMI）可能会引起拓扑相变，从而产生鲁棒的边缘模式。 为此，我们研究了一个自旋的正方形晶格，该晶格通过XXZ海森堡模型相互作用，具有铁磁纵向耦合和反铁磁横向耦合，以及上述时间调制的DMI。 该系统的拓扑保护的边缘态由单磁子激发和两个磁子束缚态的相干叠加组成。 此外，我们表明，可以通过调整与x和y方向最近邻相关的DMI驱动的相对相位来控制边缘态的手性。 显示英文摘要

摘要： We show that periodically time-modulating the Dzyaloshinskii-Moriya interaction (DMI) in a two-dimensional magnon insulator may induce a topological phase transition that results in the presence of robust edge modes. To this end, we study a square lattice of spins interacting via an XXZ Heisenberg model with a ferromagnetic longitudinal coupling and antiferromagnetic transverse coupling, as well as the aforementioned time-modulated DMI. The topologically protected edge states of this system are composed of coherent superpositions of single-magnon excitations and two magnon bound states. Furthermore, we show that the chirality of the edge states can be controlled by adjusting the relative phase for the drive on the DMI associated with nearest neighbors in the x and y directions.