论文标题
在二维磁性双层中可调的大型旋转效果
Tunable large spin Nernst effect in a two-dimensional magnetic bilayer
论文作者
论文摘要
我们从理论上研究了具有二维方形晶格中双层磁铁中木氧丝龙的拓扑自旋转运。我们的理论是由有关范德华磁铁的最新报道激发的，该报道显示了抗铁磁和铁磁阶层之间的层间磁性的可逆电动切换。磁弹性相互作用打开带隙，并允许不同激发状态之间的带间跃迁。在分层的抗铁磁铁中，由于磁杆态之间的带间跃迁，即使保留了时间反向对称性，也会发生旋转浆果曲率。我们发现，由于两个镁状状态之间的能量间距较小，分层抗铁磁铁中的自旋浆果曲率非常大。结果，旋转的Nernst电导率显示在铁磁和抗铁磁相之间的相变点处的突然增加（或减少）。我们的结果表明，在二维磁系统中，可调拓扑转运的无处不在。
We theoretically investigate topological spin transport of the magnon-polarons in bilayer magnet with two-dimensional square lattices. Our theory is motivated by recent reports on the van der Waals magnets which show the reversible electrical switching of the interlayer magnetic order between antiferromagnetic and ferromagnetic orders. The magnetoelastic interaction opens band gaps and allows the interband transition between different excitation states. In the layered antiferromagnet, due to the interband transition between the magnon-polaron states, the spin Berry curvature which allows the topological spin transport occurs even if the time-reversal symmetry is preserved. We find that the spin Berry curvature in the layered antiferromagnet is very large due to the small energy spacing between two magnon-like states. As a result, the spin Nernst conductivity shows sudden increase (or decrease) at the phase transition point between ferromagnetic and antiferromagnetic phases. Our result suggest that the ubiquity of tunable topological spin transports in two dimensional magnetic systems.
