Fano effect of a laterally coupled vertical triple quantum dot system

We analyze the influence of a local pairing on the quantum interference in nanoscopic systems. As a model system we choose the double quantum dot coupled to one metallic and one superconducting electrode in the T-shape geometry. The analysis is particularly valuable for systems containing coupled objects with considerably different broadening of energy levels. In such systems, the scattering of itinerant electrons on a discrete (or narrow) energy level gives rise to the Fano-type interference. Systems with induced superconducting order, along well understood Fano resonances, exhibit also another features on the opposite side of the Fermi level. The lineshape of these resonances differs significantly from their reflection on the opposite side of the Fermi level, and their origin was not fully understood. Here, considering the spin-polarized tunneling model, we explain a microscopic mechanism of a formation of these resonances and discuss the nature of their uncommon lineshapes. We show that the anomalous Fano profiles originate solely from the pairing of nonscattered electrons with scattered ones. We investigate also the interplay of each type of resonances with the Kondo physics and discuss the resonant features in differential conductivity.

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Transport through several four-quantum-dot topological structures

Zhi

Chen

2021

Mod. Phys. Lett. B

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In this paper, several four-quantum-dot topological structures are designed. The influence of the interdot coupling strength and intradot Coulomb interactions on the conductance is discussed. The location of the anti-resonance band can be manipulated by tuning the interdot coupling strength, which suggests a physical scheme of an effective quantum switch. The Fano anti-resonance peak may evolve into a resonance peak. For the particular value of the interdot coupling strength, two Fano anti-resonances collapse and bound states in the continuum are formed. Moreover, many-body effect makes the number of anti-resonance bands increase. This study provides a theoretical basis for the design of quantum computing devices.

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Fano effect of a laterally coupled vertical triple quantum dot system

Abstract: Fano effect of a laterally coupled vertical triple quantum dot system * He Ze-Long(贺泽龙) a)b) , Lü Tian-Quan(吕天全) a) † , and Zhang Di(张迪) c) a) Center for Condensed-

Cited by 6 publications

References 35 publications

Electron transport through a linear tri-quantum-dot molecule Aharonov-Bohm interference

Electron transport through a linear tri-quantum-dot molecule Aharonov-Bohm interference

Anomalous Fano Resonance in Double Quantum Dot System Coupled to Superconductor

Transport through several four-quantum-dot topological structures

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Fano effect of a laterally coupled vertical triple quantum dot system

Abstract: Fano effect of a laterally coupled vertical triple quantum dot system * He Ze-Long(贺泽龙) a)b) , Lü Tian-Quan(吕天全) a) † , and Zhang Di(张 迪) c) a) Center for Condensed-

Cited by 6 publications

References 35 publications

Electron transport through a linear tri-quantum-dot molecule Aharonov-Bohm interference

Electron transport through a linear tri-quantum-dot molecule Aharonov-Bohm interference

Anomalous Fano Resonance in Double Quantum Dot System Coupled to Superconductor

Transport through several four-quantum-dot topological structures

Contact Info

Product

Resources

About

Abstract: Fano effect of a laterally coupled vertical triple quantum dot system * He Ze-Long(贺泽龙) a)b) , Lü Tian-Quan(吕天全) a) † , and Zhang Di(张迪) c) a) Center for Condensed-