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Controlling zero bias anomalies in magnetic atoms provides a promisingstrategy to engineer tunable quantum many-body excitations. Here we show howtwo different quantum impurities featuring spinaron and Kondo excitations canbe controlled via quantum confinement engineering by using circular quantumcorrals on a Ag(111) surface. In corrals built from both Ag and Co adatoms, thewidth of the zero bias anomaly in the central Co adatom oscillates as afunction of corral radius with a period of half of the Ag(111) surface statewavelength. Parameters extracted for Co/Ag(111) show only small differences inextracted spinaron zero-bias anomaly between corral walls built from Ag or Coadatoms. In quantum corrals occupied with metal-free phthalocyanine, aparadigmatic $S=1/2$ Kondo system, we observe notable changes in the zero biasanomaly lineshape as a function of corral radius. Our results offer insightinto many-body Kondo and spinaron resonances where the electronic density iscontrolled by confinement engineering.

Tuning spinaron and Kondo resonances via quantum confinement