Interfering Tunneling Paths through Magnetic Molecules on Superconductors: Asymmetries of Kondo and Yu-Shiba-Rusinov Resonances

被引：33

作者：

Farinacci, Laetitia ^{[1
]}

Ahmadi, Gelavizh ^{[1
]}

Ruby, Michael ^{[1
]}

Reecht, Gael ^{[1
]}

Heinrich, Benjamin W. ^{[1
]}

Czekelius, Constantin ^{[2
]}

von Oppen, Felix ^{[3
]}

Franke, Katharina J. ^{[1
]}

机构：

[1] Free Univ Berlin, Fachbereich Phys, Arnimallee 14, D-14195 Berlin, Germany

[2] Heinrich Heine Univ Dusseldorf, Inst Organ Chem & Makromol Chem, Univ Str 1, D-40225 Dusseldorf, Germany

[3] Free Univ Berlin, Dahlem Ctr Complex Quantum Syst & Fachbereich Phy, Arnimallee 14, D-14195 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 25期

基金：

欧洲研究理事会;

关键词：

IMPURITIES; STATES; SPECTROSCOPY; ANISOTROPY; ADATOM;

D O I：

10.1103/PhysRevLett.125.256805

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetic adsorbates on superconductors induce a Kondo resonance outside and Yu-Shiba-Rusinov (YSR) bound states inside the superconducting energy gap. When probed by scanning tunneling spectroscopy, the associated differential-conductance spectra frequently exhibit characteristic bias-voltage asymmetries. Here, we observe correlated variations of Kondo and YSR asymmetries across an Fe-porphyrin molecule adsorbed on Pb(111). We show that both asymmetries originate in interfering tunneling paths via a spin-carrying orbital and the highest occupied molecular orbital (HOMO). Strong evidence for this model comes from nodal planes of the HOMO, where tunneling reveals symmetric Kondo and YSR resonances. Our results establish an important mechanism for the asymmetries of Kondo and YSR line shapes.

引用

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