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Dicke and Fano-Andreev reflections in a triple quantum-dot system.
A González I1, M Pacheco2, A M Calle2
1Departamento de Física, Universidad Técnica Federico Santa María, 110 V, Valparaíso, Casilla, Chile. alejandro.gonzalezi@usm.cl.
Scientific Reports
|February 17, 2021
Summary
This study explores quantum interference in a triple quantum-dot system, revealing Fano and Dicke-like resonances. The research shows the Dicke effect causes abrupt changes in charge transport.
Area of Science:
- Quantum physics
- Condensed matter physics
- Mesoscopic systems
Background:
- Quantum dots are nanoscale semiconductor structures exhibiting quantum mechanical properties.
- Interference effects significantly influence electron transport in quantum systems.
- Coupling quantum dots to superconducting leads introduces unique phenomena like Andreev reflection.
Purpose of the Study:
- To investigate quantum interference effects in a parallel triple quantum-dot system.
- To analyze the influence of Coulomb interactions on electronic transport.
- To study transport in both linear response and non-equilibrium regimes.
Main Methods:
- Modeling the system using a triple impurity Anderson Hamiltonian.
- Incorporating Coulomb intra-dot correlations.
- Employing the non-equilibrium Green's function formalism.
- Calculating Andreev conductance and transmittance.
Main Results:
- Andreev reflection spectra exhibit Fano and Dicke-like resonances.
- These resonances are observed with and without Coulomb interactions.
- The Dicke effect leads to abrupt changes in charge.
- Resonances are analogous to Fano and Dicke effects in atomic physics.
Conclusions:
- Quantum interference plays a crucial role in electronic transport through triple quantum-dot systems.
- Coulomb interactions and system coupling modify interference patterns.
- The observed resonances offer insights into quantum phenomena in mesoscopic devices.