Decoherence effect on Fano line shapes in double quantum dots coupled between normal and superconducting leads

2012/03/15 by J. Baranski, Jan Barański, T. Domański +1 · 28 citations
Physics and Astronomy · #Condensed matter physics #Coupling (piping) #Fano plane #Interference (communication) #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum decoherence #Quantum dot #Quantum mechanics #Semiconductor Quantum Structures and Devices #Superconductivity #cond-mat.mes-hall #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.85.205451

published in Physical Review B 85(20) (American Physical Society) · 8 pages, 7 figures

arxiv created 2012/03/15 · openalex publication_date 2012/05/29 · arxiv updated 2012/06/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We investigate the Fano-type spectroscopic line shapes of the T-shape double quantum dot coupled between the conducting and superconducting electrodes and analyze their stability on a decoherence. Because of the proximity effect the quantum interference patterns appear simultaneously at \ifmmode±\else\textpm\fi\ensuremathε₂, where \ensuremathε₂ is an energy of the side-attached quantum dot. We find that decoherence gradually suppresses both such interferometric structures. We also show that at low temperatures another tiny Fano-type structure can be induced upon forming the Kondo state on the side-coupled quantum dot due to its coupling to the floating lead.

Citations

• Fano and Kondo Resonance in Electronic Current through Nanodevices
• Fano-Kondo Interplay in a Side-Coupled Double Quantum Dot
• Tunneling through an Anderson impurity between superconductors
• Effect of a voltage probe on the phase-coherent conductance of a ballistic chaotic cavity
• Resonant Andreev Tunneling in Strongly Interacting Quantum Dots
• Voltage-probe and imaginary-potential models for dephasing in a chaotic quantum dot
• Fano resonance in a quantum wire with a side-coupled quantum dot
• Influence of pair coherence on charge tunneling through a quantum dot connected to a superconducting lead
• Charge Transfer Induced Persistent Current and Capacitance Oscillations
• Electron transport through a strongly interacting quantum dot coupled to a normal metal and BCS superconductor