Metallicity and anomalous Hall effect in epitaxially strained, atomically thin RuO₂ films.

ABSTRACT: The anomalous Hall effect (AHE), a hallmark of time-reversal symmetry breaking, has been reported in rutile RuO₂, a debated metallic altermagnetic candidate. Previously, AHE in RuO₂ was observed only in strain-relaxed thick films under extremely high magnetic fields (~50 T). Yet, in ultrathin strained films with distinctive anisotropic electronic structures, there are no reports, likely due to disorder and defects suppressing metallicity thus hindering its detection. Here, we demonstrate that ultrathin, fully strained 2 nm TiO₂/t nm RuO₂/TiO₂ (110) heterostructures, grown by hybrid molecular beam epitaxy, retain metallicity and exhibit a sizeable AHE at a significantly lower magnetic field (< 9 T). Density functional theory calc

SUBMITTER: Jeong SG 

PROVIDER: S-EPMC12184392 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature