GIST Scholar
College of Natural Sciences
Department of Physics and Photon Science
1. Journal Articles
Observation of mirror-odd and mirror-even spin texture in ultrathin epitaxially strained RuO2 films
- Type
- Article
- Citation
- Science Advances, v.12, no.31
- Issued Date
- 2026-07
- Abstract
- Recently, rutile ruthenium dioxide (RuO2) has attracted renewed interest due to expectations of prominent altermagnetic spin splitting. However, accumulating experimental evidence suggests that, in its bulk and thick-film forms, RuO2 does not display any form of magnetic ordering. Despite this, the spin structure of RuO2 remains largely unexplored in the ultrathin limit, where substrate-imposed epitaxial strain can be substantial. Here, we use spin-resolved angle-resolved photoemission spectroscopy, supported by ab initio calculations, to reveal the electronic structure of 2-nanometer-thick epitaxial RuO2 heterostructures. We observe an unconventional spin texture characterized by the coexistence of mirror-even and mirror-odd momentum-dependent components. A comprehensive symmetry analysis rules out nonmagnetic origins of this spin texture. These findings suggest an emergent nonrelativistic spin structure enabled by epitaxial strain in the ultrathin limit, marking a distinct departure from the behavior of relaxed or bulk RuO2. Our work opens previously unexplored perspectives for exploring symmetry-breaking mechanisms and spin textures in oxide heterostructures.
- Publisher
- American Association for the Advancement of Science
- ISSN
- 2375-2548
- Appears in Collections:
- Department of Physics and Photon Science > 1. Journal Articles
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