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Engineering the Eigenstates of Coupled Spin-1/2 Atoms on a Surface

Title
Engineering the Eigenstates of Coupled Spin-1/2 Atoms on a Surface
Authors
Yang, KaiBae, YujeongPaul, WilliamNatterer, Fabian D.Willke, PhilipLado, Jose L.Ferron, AlejandroChoi, TaeyoungFernandez-Rossier, JoaquinHeinrich, Andreas J.Lutz, Christopher P.
Ewha Authors
Andreas Heinrich최태영
Issue Date
2017
Journal Title
PHYSICAL REVIEW LETTERS
ISSN
0031-9007JCR Link1079-7114JCR Link
Citation
vol. 119, no. 22
Publisher
AMER PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
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.
DOI
10.1103/PhysRevLett.119.227206
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자연과학대학 > 물리학전공 > Journal papers
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