Equivalence between a topological and non-topological quantum dot - hybrid structures

In this work, we demonstrate an equivalence on the single-electron transport properties between systems of different nature, a topological quantum system and a (conventional) non-topological one. Our results predicts that the Fano resonances obtained in a T-shaped double quantum dot system coupled t...

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Bibliographic Details
Published inarXiv.org
Main Authors Calle, Ana M, Pacheco, Mónica, Orellana, Pedro A, Otálora, Jorge A
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 28.02.2019
Subjects
Electron transport
Equivalence
Hybrid structures
Nanowires
Quantum dots
Quantum theory
Resistance
Single electrons
Superconductivity
T shape
Topological superconductors
Transport properties
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Summary:In this work, we demonstrate an equivalence on the single-electron transport properties between systems of different nature, a topological quantum system and a (conventional) non-topological one. Our results predicts that the Fano resonances obtained in a T-shaped double quantum dot system coupled to two normal leads and one superconducting lead (QD-QD-S) are identical to the obtained in a ring system composed of a quantum dot coupled to two Majorana bound states confined at the ends of a one dimensional topological superconductor nanowire (QD-MBSs). We show that the non-zero value of the Fano (anti)resonance in the conductance of the QD-MBSs systems is due to a complex Fano factor qM , which is identical to the complex Fano factor qS of the QD-QD-S. The complex nature of qS can be understood as a sign of a phase introduced by the superconducting lead in the QD-QD-S. It is because of this phase that the equivalence between the QD-QD-S and the QD-MBSs is possible. We believe that our results can motivate further theoretical and experimental works toward the understanding of transport properties of topological quantum hybrid structures from conventional non-topological quantum systems.
ISSN:2331-8422