Fano resonance in a normal metal/ferromagnet-quantum dot-superconductor device

Abstract

We investigate theoretically the Andreev transport through a quantum dot strongly coupled with a normal metal/ferromagnet and a superconductor (N/F-QD-S), in which the interplay between the Kondo resonance and the Andreev bound states (ABSs) has not been clearly clarified yet. Here we show that the interference between the Kondo resonance and the ABSs modifies seriously the lineshape of the Kondo resonance, which manifests as a Fano resonance. The ferromagnetic lead with spin-polarization induces an effective field, which leads to splitting both of the Kondo resonance and the ABSs. The spin-polarization together with the magnetic field applied provides an alternative way to tune the lineshape of the Kondo resonances, which is dependent of the relative positions of the Kondo resonance and of the ABSs. These results indicate that the interplay between the Kondo resonance and the ABSs can significantly affect the Andreev transport, which could be tested by experiments.

8pages, 7figures

References in corpus (13)

• Zero-bias anomaly in a nanowire quantum dot coupled to superconductors
• Kondo effect in quantum dots coupled to ferromagnetic leads
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Even-odd effect in Andreev Transport through a Carbon Nanotube Quantum Dot
• Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads
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• The Fano resonance for Anderson impurity systems
• Josephson current in strongly correlated double quantum dots
• Nonequilibrium transport via spin-induced sub-gap states in superconductor/quantum dot/normal metal cotunnel junctions
• Influence of the pair coherence on the charge tunneling through a quantum dot connected to a superconducting lead
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• Supercurrent and multiple singlet-doublet phase transitions of a quantum dot Josephson junction inside an Aharonov-Bohm ring
• Compensation effect in carbon nanotube quantum dots coupled to polarized electrodes in the presence of spin-orbit coupling

Cited by in corpus (5)

• Large thermoelectric power and figure of merit in a ferromagnetic-quantum dot-superconducting device
• Kondo screening of Andreev bound states in an N-QD-S system
• Fano-Andreev effect in T-shape double-quantum-dot in the Kondo regime
• Well-defined Fano effect in the Andreev reflection process of a parallel double-quantum-dot structure
• Inelastic Kondo-Andreev tunnelings in a vibrating quantum dot