Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Altermagnets II

MA 13.7: Vortrag

Dienstag, 18. März 2025, 11:00–11:15, H20

Spin-transfer and topological Hall physics in d-wave altermagnets — •Ricardo Zarzuela — Johannes Gutenberg Universität Mainz, Mainz, Germany

Altermagnets, a novel magnetic phase of matter exhibiting zero net magnetization, anisotropic spin-split isoenergy surfaces and time reversal-symmetry-broken momentum-dependent spin splittings in the electronic band structure, have gained enormous momentum in the recent years due to their potential usage as active elements in Terahertz spintronic-based technologies [1]. In this talk, I will introduce an effective long-wavelength theory for charge carriers flowing within a d-wave altermagnet, from which the spin-splitter effect can be inferred as well as an unconventional spin-transfer response of the electron fluid. Reciprocally, the presence of altermagnetic textures induces the deflection of the electron trajectories. In this regard, I will also discuss how the d-wave nature of the altermagnet yields unconventional features to the topological Hall conductivity, which can be observed experimentally.

[1] L. Šmejkal, J. Sinova and T. Jungwirth, Phys. Rev. X 12, 031042 (2022); ibid. 040501 (2022).

Keywords: d-wave altermagnet; spin-transfer effect; topological Hall effect