Probing resonating valence bond states in artificial quantum magnets
Open Access
- 12 February 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 12 (1), 1-7
- https://doi.org/10.1038/s41467-021-21274-5
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.Funding Information
- RCUK | Engineering and Physical Sciences Research Council (EP/L011972/1, EP/P000479/1)
- Institute for Basic Science (IBS-R027-D1)
- United States Department of Defense | United States Navy | Office of Naval Research
This publication has 46 references indexed in Scilit:
- Quantum spin liquid statesReviews of Modern Physics, 2017
- Evidence for a gapped spin-liquid ground state in a kagome Heisenberg antiferromagnetScience, 2015
- Fractional excitations in the square-lattice quantum antiferromagnetNature Physics, 2014
- Fractional spinon excitations in the quantum Heisenberg antiferromagnetic chainNature Physics, 2013
- Fractionalized excitations in the spin-liquid state of a kagome-lattice antiferromagnetNature, 2012
- Experimental Realization of Plaquette Resonating Valence-Bond States with Ultracold Atoms in Optical SuperlatticesPhysical Review Letters, 2012
- Quantum simulation of the wavefunction to probe frustrated Heisenberg spin systemsNature Physics, 2011
- Spin liquids in frustrated magnetsNature, 2010
- Quantum dynamics and entanglement of spins on a square latticeProceedings of the National Academy of Sciences of the United States of America, 2007
- The Resonating Valence Bond State in La 2 CuO 4 and SuperconductivityScience, 1987