通过量子限制调控自旋子与近藤共振
Tuning spinaron and Kondo resonances via quantum confinement
AI总结：
本研究通过Ag(111)表面圆形量子围栏的量子限制工程，调控磁性原子的自旋子和近藤共振，发现零偏压异常宽度随围栏半径振荡，为多体量子激发调控提供新途径。
摘要：
控制磁性原子中的零偏压异常为设计可调谐的量子多体激发提供了一种有前景的策略。在此，我们展示了如何通过利用Ag(111)表面上的圆形量子围栏进行量子限制工程，来控制两种分别具有自旋子和近藤激发的不同量子杂质。在由Ag和Co吸附原子构建的围栏中，中心Co吸附原子的零偏压异常宽度随围栏半径振荡，周期为Ag(111)表面态波长的一半。针对Co/Ag(111)提取的参数显示，由Ag或Co吸附原子构建的围栏壁之间，提取的自旋子零偏压异常仅存在微小差异。在由无金属酞菁占据的量子围栏中，这是一个$S=1/2$近藤系统，我们观察到零偏压异常线形随围栏半径发生显著变化。我们的结果为多体近藤和自旋子共振提供了见解，其中电子密度通过限制工程进行控制。
英文摘要：
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 $S=1/2$ 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.
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