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Engineering the Eigenstates of Coupled Spin-1/2 Atoms on a Surface
- Engineering the Eigenstates of Coupled Spin-1/2 Atoms on a Surface
- Yang, Kai; Bae, Yujeong; Paul, William; Natterer, Fabian D.; Willke, Philip; Lado, Jose L.; Ferron, Alejandro; Choi, Taeyoung; Fernandez-Rossier, Joaquin; Heinrich, Andreas J.; Lutz, Christopher P.
- Ewha Authors
- Andreas Heinrich; 최태영
- Issue Date
- Journal Title
- PHYSICAL REVIEW LETTERS
- 0031-9007; 1079-7114
- vol. 119, no. 22
- AMER PHYSICAL SOC
- SCI; SCIE; SCOPUS
- Quantum spin networks having engineered geometries and interactions are eagerly pursued for quantum simulation and access to emergent quantum phenomena such as spin liquids. Spin-1/2 centers are particularly desirable, because they readily manifest coherent quantum fluctuations. Here we introduce a controllable spin-1/2 architecture consisting of titanium atoms on a magnesium oxide surface. We tailor the spin interactions by atomic-precision positioning using a scanning tunneling microscope (STM) and subsequently perform electron spin resonance on individual atoms to drive transitions into and out of quantum eigenstates of the coupled-spin system. Interactions between the atoms are mapped over a range of distances extending from highly anisotropic dipole coupling to strong exchange coupling. The local magnetic field of the magnetic STM tip serves to precisely tune the superposition states of a pair of spins. The precise control of the spin-spin interactions and ability to probe the states of the coupled-spin network by addressing individual spins will enable the exploration of quantum many-body systems based on networks of spin-1/2 atoms on surfaces.
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