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

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Title
Engineering the Eigenstates of Coupled Spin-1/2 Atoms on a Surface
Author(s)
Kai Yang; Yujeong Bae; William Paul; Fabian D. Natterer; Philip Willke; Jose L. Lado; Alejandro Ferrón; Taeyoung Choi; Joaquín Fernández-Rossier; Andreas J. Heinrich; Christopher P. Lutz
Publication Date
2017-11
Journal
PHYSICAL REVIEW LETTERS, v.119, no.22, pp.227206 -
Publisher
AMER PHYSICAL SOC
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
URI
https://pr.ibs.re.kr/handle/8788114/4148
ISSN
0031-9007
Appears in Collections:
Center for Quantum Nanoscience(양자나노과학 연구단) > Journal Papers (저널 논문)
Files in This Item:
PhysRevLett.119.227206.pdfDownload

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