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자연과학대학
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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 Heinrich
;
최태영
SCOPUS Author ID
Andreas Heinrich
; 최태영
Issue Date
2017
Journal Title
Physical Review Letters
ISSN
0031-9007
Citation
Physical Review Letters vol. 119, no. 22
Publisher
American Physical Society
Indexed
SCIE; 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
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