William Ratcliff1,2,Julie Borchers1,Colin Heikes1,2,Patrick Quartermann1,Seng Huat Lee3,Zhiqiang Mao3,Jun Zhu3
NIST1,University of Maryland2,The Pennsylvania State University3
William Ratcliff1,2,Julie Borchers1,Colin Heikes1,2,Patrick Quartermann1,Seng Huat Lee3,Zhiqiang Mao3,Jun Zhu3
NIST1,University of Maryland2,The Pennsylvania State University3
In this talk, I discuss our recent results on the first intrinsic antiferromagnetic topological insulator, Mn(Bi,Sb)<sub>2</sub>Te<sub>4</sub>. In this Van der Waals material, we can control the magnetic state through chemical substitution, as well as through the application of a magnetic field. These knobs allow us to effect the topology of the band structure and thus the transport. We apply a number of probes, including transport, susceptibility, neutron scattering, ARPES, and TEM to determine the physics of this exciting material [1,2]. In particular, we discuss how recent neutron measurements shed new light on the anomolous transport in this material.<br/><br/>[1] "Spin Scattering and noncollinear spin-structure induced intrinsic anomalous Hall Effect in antiferromagnetic topological insulator MnnBi<sub>2</sub>Te<sub>4</sub>, Seng Huat Lee et al, Phys. Rev. Research 1, 012011 (2019)<br/>[2] "Ferromagnetism in van der Walls compound MnSb<sub>1.8</sub>Bi<sub>.2</sub>Te<sub>4</sub>" Yangyang Chen et al, Phys. Rev. Matt. 4, 064411 (2020).