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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 K.Bae Y.Paul W.Natterer F.D.Willke P.Lado J.L.Ferrón A.Choi T.Fernández-Rossier J.Heinrich A.J.Lutz C.P.
Ewha Authors
Andreas Heinrich최태영
Issue Date
2017
Journal Title
Physical Review Letters
ISSN
0031-9007JCR Link
Citation
Physical Review Letters vol. 119, no. 22
Publisher
American Physical Society
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
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. © 2017 American Physical Society.
DOI
10.1103/PhysRevLett.119.227206
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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