Engineering the eigenstates of coupled spin-1/2 atoms on a surface

12 Dec 2017  ·  Yang Kai, Bae Yujeong, Paul William, Natterer Fabian D., Willke Philip, Lado Jose L., Ferrón Alejandro, Choi Taeyoung, Fernández-Rossier Joaquín, Heinrich Andreas J., Lutz Christopher P. ·

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 (ESR) 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 exploration of quantum many-body systems based on networks of spin-1/2 atoms on surfaces. read more

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Mesoscale and Nanoscale Physics