Probing resonating valence bond states in artificial quantum magnets

Kai Yang (), Soo-Hyon Phark, Yujeong Bae, Taner Esat, Philip Willke, Arzhang Ardavan, Andreas J. Heinrich () and Christopher P. Lutz ()
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Kai Yang: IBM Almaden Research Center
Soo-Hyon Phark: IBM Almaden Research Center
Yujeong Bae: IBM Almaden Research Center
Taner Esat: IBM Almaden Research Center
Philip Willke: IBM Almaden Research Center
Arzhang Ardavan: University of Oxford
Andreas J. Heinrich: Institute for Basic Science (IBS)
Christopher P. Lutz: IBM Almaden Research Center

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-21274-5

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