Quantum engineered Kondo lattices

Jeremy Figgins, Laila S. Mattos, Warren Mar, Yi-Ting Chen, Hari C. Manoharan () and Dirk K. Morr ()
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Jeremy Figgins: University of Illinois at Chicago
Laila S. Mattos: SLAC National Accelerator Laboratory
Warren Mar: SLAC National Accelerator Laboratory
Yi-Ting Chen: SLAC National Accelerator Laboratory
Hari C. Manoharan: SLAC National Accelerator Laboratory
Dirk K. Morr: University of Illinois at Chicago

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Atomic manipulation techniques have provided a bottom-up approach to investigating the unconventional properties and complex phases of strongly correlated electron materials. By engineering artificial systems containing tens to thousands of atoms with tailored electronic or magnetic properties, it has become possible to explore how quantum many-body effects emerge as the size of a system is increased from the nanoscale to the mesoscale. Here we investigate both theoretically and experimentally the quantum engineering of nanoscale Kondo lattices – Kondo droplets – exemplifying nanoscopic replicas of heavy-fermion materials. We demonstrate that by changing a droplet’s real-space geometry, we can not only create coherently coupled Kondo droplets whose properties asymptotically approach those of a quantum-coherent Kondo lattice, but also markedly increase or decrease the droplet’s Kondo temperature. Furthermore we report on the discovery of a new quantum phenomenon – the Kondo echo – a signature of droplets containing Kondo holes functioning as direct probes of spatially extended, quantum-coherent Kondo cloud correlations.

Date: 2019
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DOI: 10.1038/s41467-019-13446-1

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