Tuning spinaron and Kondo resonances via quantum confinement

This repository contains raw data files for STM topography and tunneling spectra on Co and H2Pc in quantum corrals on Ag(111). Analysis scripts used to extract Fano resonance parameters can be found at https://github.com/abekipnis/Kondo-Aalto. Abstract of the paper: 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 extracted spinaron zero-bias anomaly between corral walls built from Ag or Co adatoms. In quantum corrals occupied with metal-free phthalocyanine, a paradigmatic S=1/2 Kondo system, we observe notable changes in the zero bias anomaly lineshape as a function of corral radius. Our results offer insight into many-body Kondo and spinaron resonances where the electronic density is controlled by confinement engineering.本仓库收录了Ag(111)晶面上量子围栏中钴（Co）与二氢酞菁（H₂Pc）的扫描隧道显微镜（Scanning Tunneling Microscope, STM）形貌数据与隧穿谱原始文件。 用于提取法诺共振（Fano resonance）参数的分析脚本可于https://github.com/abekipnis/Kondo-Aalto获取。 论文摘要：调控磁性原子的零偏反常（zero bias anomaly）是构筑可调谐量子多体激发的颇具前景的策略。本文借助Ag(111)晶面上的圆形量子围栏，展示了如何通过量子限域工程调控两种分别具有自旋隆（sparon）激发与近藤（Kondo）激发的量子杂质。在由Ag与Co吸附原子构筑的量子围栏中，中心Co吸附原子的零偏反常宽度随围栏半径呈周期性振荡，振荡周期为Ag(111)表面态波长的一半。针对Co/Ag(111)体系提取的参数显示，由Ag或Co吸附原子构成的围栏壁所对应的自旋隆零偏反常，其提取结果仅存在微小差异。在由无金属酞菁（典型的S=1/2近藤体系）填充的量子围栏中，我们观测到零偏反常的线型随围栏半径发生显著变化。本研究结果为通过限域工程调控电子密度的多体近藤与自旋隆共振提供了新的认知视角。