Joseph G. Checkelsky
April 13(Thu) - April 13(Thu), 2017
Transport in Strong Spin-Orbit Coupled Antiferromagnets
Joseph G. Checkelsky
Massachusetts Institute of Technology, Department of Physics (Assistant professor)
The combination of strong spin-orbit coupling and magnetism gives rise to unusual electronic behavior ranging from magnetically driven quantum Hall states to spin torque effects. Here we focus on the combination of strong-spin orbit effects and rare-earth based antiferromagnetic conductors. The low energy scale for manipulation of magnetism in these systems allows for the control of the antiferromagnetic ground state which in turn has a strong influence on the electronic structure and properties. In particular, in half-Heusler materials we find evidence for a Berry phase driven Hall effect in the non-collinear structure and in a rock-salt structures an orbitally driven magnetoresistance that can be either strongly positive or negative [1]. We comment on the connections to recent discussion of topological ground states in these systems and the ground state control they exhibit.
1. T. Suzuki, R. Chisnell, A. Devarakonda, Y.-T. Liu, W. Feng, D. Xiao, J. W. Lynn and J. G. Checkelsky. Nature Physics 12, 1119-1123 (2016).