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Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO 2

Fedchenko, Olena; Minár, Jan; Akashdeep, Akashdeep; D’Souza, Sunil Wilfred; Vasilyev, Dmitry; Tkach, Olena; Odenbreit, Lukas; Nguyen, Quynh; Kutnyakhov, Dmytro; Wind, Nils; Wenthaus, Lukas; Scholz, Markus; Rossnagel, Kai; Hoesch, Moritz; Aeschlimann, Martin; Stadtmüller, Benjamin; Kläui, Mathias; Schönhense, Gerd; Jungwirth, Tomas; Hellenes, Anna Birk; Jakob, Gerhard; Šmejkal, Libor; Sinova, Jairo; Elmers, Hans-Joachim

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Authors

Olena Fedchenko

Jan Minár

Akashdeep Akashdeep

Sunil Wilfred D’Souza

Dmitry Vasilyev

Olena Tkach

Lukas Odenbreit

Quynh Nguyen

Dmytro Kutnyakhov

Nils Wind

Lukas Wenthaus

Markus Scholz

Kai Rossnagel

Moritz Hoesch

Martin Aeschlimann

Benjamin Stadtmüller

Mathias Kläui

Gerd Schönhense

TOMAS JUNGWIRTH tomas.jungwirth@nottingham.ac.uk
Research Professor of Ferromagnetic Semiconductors

Anna Birk Hellenes

Gerhard Jakob

Libor Šmejkal

Jairo Sinova

Hans-Joachim Elmers



Abstract

Altermagnets are an emerging elementary class of collinear magnets. Unlike ferromagnets, their distinct crystal symmetries inhibit magnetization while, unlike antiferromagnets, they promote strong spin polarization in the band structure. The corresponding unconventional mechanism of time-reversal symmetry breaking without magnetization in the electronic spectra has been regarded as a primary signature of altermagnetism but has not been experimentally visualized to date. We directly observe strong time-reversal symmetry breaking in the band structure of altermagnetic RuO2 by detecting magnetic circular dichroism in angle-resolved photoemission spectra. Our experimental results, supported by ab initio calculations, establish the microscopic electronic structure basis for a family of interesting phenomena and functionalities in fields ranging from topological matter to spintronics, which are based on the unconventional time-reversal symmetry breaking in altermagnets.

Citation

Fedchenko, O., Minár, J., Akashdeep, A., D’Souza, S. W., Vasilyev, D., Tkach, O., …Elmers, H. (2024). Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO 2. Science Advances, 10(5), Article eadj4883. https://doi.org/10.1126/sciadv.adj4883

Journal Article Type Article
Acceptance Date Dec 29, 2023
Online Publication Date Jan 31, 2024
Publication Date Jan 31, 2024
Deposit Date Mar 8, 2024
Publicly Available Date Mar 12, 2024
Journal Science Advances
Electronic ISSN 2375-2548
Publisher American Association for the Advancement of Science
Peer Reviewed Peer Reviewed
Volume 10
Issue 5
Article Number eadj4883
DOI https://doi.org/10.1126/sciadv.adj4883
Public URL https://nottingham-repository.worktribe.com/output/30667749
Publisher URL https://www.science.org/doi/10.1126/sciadv.adj4883

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