Tuning spinaron and Kondo resonances via quantum confinement

Markus Aapro*, Abraham Kipnis*, Jose L. Lado, Shawulienu Kezilebieke, Peter Liljeroth*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Controlling zero-bias anomalies in magnetic atoms provides a promising strategy to engineer tunable quantum many-body excitations. Here we show how two different quantum impurities featuring spinaron and Kondo excitations can be controlled via quantum confinement engineering by using circular quantum corrals on a Ag(111) surface. In corrals built from both Ag and Co adatoms, the width of the zero-bias anomaly in the central Co adatom oscillates as a function of corral radius with a period of half of the Ag(111) surface state wavelength. Parameters extracted for Co/Ag(111) show only small differences in the extracted spinaron zero-bias anomaly between corral walls built from Ag or Co adatoms. In quantum corrals occupied by metal-free phthalocyanine, a S=1/2 Kondo system, we observe notable changes in the zero-bias anomaly line shape as a function of corral radius. Our results offer insight into many-body Kondo and spinaron resonances in which the electronic density is controlled by confinement engineering.

Original languageEnglish
Article number195415
Pages (from-to)1-8
Number of pages8
JournalPhysical Review B
Issue number19
Publication statusPublished - 15 May 2024
MoE publication typeA1 Journal article-refereed


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