Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.42: Poster

Tuesday, September 6, 2022, 17:30–20:00, P2

Nonrelativistic spin currents in altermagnets — •Rodrigo Jaeschke-Ubiergo, Libor Šmejkal, and Jairo Sinova — Institut für Physik, Johannes Gutenberg Universität Mainz, Germany

Altermagnetism has emerged recently as a third basic collinear magnetic phase [1], in addition to ferromagnets and antiferromagnets. Conventional antiferromagnets exhibit two sublattices with opposite magnetic moment related by translation or inversion. In altermagnets the magnetic sublattices are connected by a rotation or a mirror operation. The particular symmetry causes that altermagnets display time-reversal (T) symmetry breaking and spin split band structure even in absence of spin-orbit coupling [2].

In this work, we study the spin conductivity tensor in altermagnets by using spin group theory formalism [1]. We also use Kubo’s linear response to calculate the spin conductivity tensor in all the altermagnetic spin point groups models. Additionally, we indentify and sort 200 altermagnetic candidates into spin conductivity tensor classes. We will discuss some spin point groups that allow for a transverse spin current in detail. This is the case of spin splitter current in RuO₂ [3,4], which is a nonrelativistic effect that conserves spin unlike in general magnetic spin Hall effect in noncollinear magnets. Moreover, the spin conductivity tensor is symmetric and T-odd, which makes it different to the conventional spin Hall effect.

[1] Šmejkal, et al. arXiv preprint arXiv:2105.05820, 2021. [2] Šmejkal, et al. Sci.Adv 2020. [3] Gonzalez-Hernandez, et al. PRL 2021. [4] Šmejkal, et al. PRX 2022.