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PGI-1 Talk: Libor Smejkal

Electronic Structure of Crystal Hall Antiferromagnets

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10 Apr 2019 11:30
venue
PGI Lecture Hall

Uni Mainz

Abstract:

The family of Hall effects, even 137 years after its first member was discovered, continue to play a central role in condensed matter research for their fascinating topological, relativistic, and quantum mechanical nature as well as prospective nanoelectronic applications. The spontaneous Hall effect was in last decade observed also in certain noncoplanar spin liquid candidates and noncollinear antiferromagnets cementing the notion of spontaneous topological and spontaneous anomalous Hall antiferromagnets.

In this talk, we will introduce a complementary mechanism in crystals whose magnetic structure alone generates no Hall response and the required breaking of time-reversal and other symmetries is caused by the combined effect of trivial magnetic order and the arrangement of non-magnetic atoms in the lattice. We identify notorious collinear antiferromagnets hosting this crystal Hall effect in its pristine form, which were previously anticipated to be prevented from spontaneous Hall signals. We will discuss the consequences of our new understanding of electronic structure of rutile and noncentrosymmetric antiferromagnets.

In the last part of the talk, we will outline future directions of the emerging field of topological antiferromagnetic spintronics, including research of Dirac-Neel antiferromagnets. Dirac – Neel antiferromagnets, e.g. CuMnAs and Mn2Au, can simultaneously host Dirac quasiparticle electronic structure and Neel spin-orbit torques allowing for the THz control of antiferromagnetic order and relativistic metal-insulator transition.

Contact

Prof. Dr. Yuriy Mokrousov
Phone: +49 2461 61-4434
email: y.mokrousov@fz-juelich.de

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