Manipulating electronic and magnetic states in metallized ultrathin strontium ruthenate

This is the authors' abstract. We don't add key points for this paper.

Probing topological quantum states at the atomic limit is a frontier in physics, yet it is often hindered by the ``dead layer'' effect in ultrathin films. The authors overcome this challenge by designing SrRuO₃/SrIrO₃ heterostructures, demonstrating that interfacial effects can stabilize metallicity and ferromagnetism in SrRuO₃ down to a single unit cell. Angle-resolved photoemission spectroscopy provides direct evidence of its robust metallic band structure. This work not only revives exotic states in ultrathin SrRuO₃ but also showcases a powerful pathway to tune the Berry curvature and anomalous Hall effect via interface engineering, opening new avenues for designing topological quantum devices in the two-dimensional limit.