William Ratcliff (NIST)

Date: Mon. April 11th, 2022, 12:45 pm-1:45 pm
Location: via Zoom (Meeting ID: 913 7787 8431 Passcode: 577420)
Website: https://www.nist.gov/people/william-d-ratcliff

Investigations of the first intrinsic topological insulator: MnBi₂Te₄

William Ratcliff

National Institute of Standards and Technology

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Abstract.—In this talk, I discuss our recent results on the first intrinsic antiferromagnetic topological insulator, MnBi₂Te₄. 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].

[1] “Spin Scattering and noncollinear spin-structure induced intrinsic anomalous Hall Effect in antiferromagnetic topological insulator MnnBi₂Te₄, Seng Huat Lee et al, Phys. Rev. Research 1, 012011 (2019)

[2] “Ferromagnetism in van der Walls compound MnSb_1.8Bi_0.2Te₄” Yangyang Chen et al, Phys. Rev. Matt. 4, 064411 (2020)

Host: Harsh Mathur