Spin-state engineering of single titanium adsorbates on ultrathin magnesium oxide.

ABSTRACT: Single atomic adsorbates on ultrathin insulating films provide a promising route towards building bottom-up quantum architectures based on atomically identical yet individually addressable spin qubits on solid surfaces. A key challenge in engineering quantum-coherent spin nanostructures lies in understanding and controlling the spin state of individual adsorbates. In this work, we investigate single titanium (Ti) atoms adsorbed on MgO/Ag(100) surfaces using a combined scanning tunneling microscopy and electron spin resonance. Our measurements reveal two distinct spin states, S = 1/2 and S = 1, depending on the local adsorption site and the thickness of the MgO film. Density functional theory calculations suggest a Ti⁺ configuration for the Ti adsorbates with approximately 3 elec

SUBMITTER: Phark SH 

PROVIDER: S-EPMC12905244 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature