Surface skyrmions and dual topological Hall effect in antiferromagnetic topological insulator EuCd${}_2$As${}_2$

Min Wu, R. Yang, Xiangde Zhu +17

In this work, we synthesized single crystal of EuCd${}_2$As${}_2$, which exhibits A-type antiferromagnetic (AFM) order with in-plane spin orientation below $T_N$ = 9.5~K.Optical spectr…