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Probing resonating valence bond states in artificial quantum magnets

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Title
Probing resonating valence bond states in artificial quantum magnets
Author(s)
Kai Yang; 양자나노과학 연구단; 양자나노과학 연구단; 양자나노과학 연구단; 양자나노과학 연구단; Arzhang Ardavan; Andreas J. Heinrich; Christopher P. Lutz
Publication Date
2021-02-12
Journal
NATURE COMMUNICATIONS, v.12, no.1
Publisher
NATURE RESEARCH
Abstract
Designing and characterizing the many-body behaviors of quantum materials represents a prominent challenge for understanding strongly correlated physics and quantum information processing. We constructed artificial quantum magnets on a surface by using spin-1/2 atoms in a scanning tunneling microscope (STM). These coupled spins feature strong quantum fluctuations due to antiferromagnetic exchange interactions between neighboring atoms. To characterize the resulting collective magnetic states and their energy levels, we performed electron spin resonance on individual atoms within each quantum magnet. This gives atomic-scale access to properties of the exotic quantum many-body states, such as a finite-size realization of a resonating valence bond state. The tunable atomic-scale magnetic field from the STM tip allows us to further characterize and engineer the quantum states. These results open a new avenue to designing and exploring quantum magnets at the atomic scale for applications in spintronics and quantum simulations. The resonating valence bond state is a spin-liquid state where spins continuously alter their singlet partners. Here Yang et al. use spin-1/2 atoms precision-placed by a scanning tunnelling microscope to create artificial quantum magnets exhibiting the resonating valence bond state.
URI
https://pr.ibs.re.kr/handle/8788114/9326
DOI
10.1038/s41467-021-21274-5
ISSN
2041-1723
Appears in Collections:
Center for Quantum Nanoscience(양자나노과학 연구단) > 1. Journal Papers (저널논문)
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