Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 52: Altermagnets

MA 52.1: Talk

Friday, March 22, 2024, 09:30–09:45, EB 202

Strain induced antiferromagnetic to altermagnetic transition — •Atasi Chakraborty — Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany

Altermagnets, unconventional collinear compensated magnetic systems, offer advantages of spin polarized current akin to ferromagnets, and THz functionalities similar to antiferromagnets, while introducing new novel effects like spin-splitter currents. A key challenge for future applications and functionalization of altermagnets, is to demonstrate controlled transitioning to the altermagnetic phase from other conventional phases in a single material. Here we prove a viable path towards overcoming this challenge through a strain-induced transition from an antiferromagnetic to an altermagnetic phase in ReO2. Combining spin group symmetry analysis and ab initio calculations, we demonstrate that under compressive strain ReO2 undergoes such transition, lifting the Kramer*s degeneracy of the band structure of the antiferromagnetic phase in the non-relativistic regime. In addition, we show that this magnetic transition is accompanied by a change in the non-trivial surface state topology from one phase to the other. We calculate the distinct signature of spin polarized spectral functions of the two phases, which can be detected in angle resolved photo-emission spectroscopy experiments.

Keywords: Magnetic Transition; Altermagnet; Antiferromagnet; Angle resolved photo-emission spectroscopy