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Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States

We theoretically analyze phonon-assisted tunneling transport in a quantum dot side connected to a Majorana bound state in a topological superconducting nanowire. We investigate the behavior of the current through the dot, for a range of experimentally relevant parameters, in the presence of one long...

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Autores principales: Máthé, Levente, Kovács-Krausz, Zoltán, Botiz, Ioan, Grosu, Ioan, El Anouz, Khadija, El Allati, Abderrahim, Zârbo, Liviu P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10222149/
https://www.ncbi.nlm.nih.gov/pubmed/37242032
http://dx.doi.org/10.3390/nano13101616
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author Máthé, Levente
Kovács-Krausz, Zoltán
Botiz, Ioan
Grosu, Ioan
El Anouz, Khadija
El Allati, Abderrahim
Zârbo, Liviu P.
author_facet Máthé, Levente
Kovács-Krausz, Zoltán
Botiz, Ioan
Grosu, Ioan
El Anouz, Khadija
El Allati, Abderrahim
Zârbo, Liviu P.
author_sort Máthé, Levente
collection PubMed
description We theoretically analyze phonon-assisted tunneling transport in a quantum dot side connected to a Majorana bound state in a topological superconducting nanowire. We investigate the behavior of the current through the dot, for a range of experimentally relevant parameters, in the presence of one long-wave optical phonon mode. We consider the current-gate voltage, the current-bias voltage and the current-dot–Majorana coupling characteristics under the influence of the electron–phonon coupling. In the absence of electron–phonon interaction, the Majorana bound states suppress the current when the gate voltage matches the Fermi level, but the increase in the bias voltage counteracts this effect. In the presence of electron–phonon coupling, the current behaves similarly as a function of the renormalized gate voltage. As an added feature at large bias voltages, it presents a dip or a plateau, depending on the size of the dot–Majorana coupling. Lastly, we show that the currents are most sensitive to, and depend non-trivially on the parameters of the Majorana circuit element, in the regime of low temperatures combined with low voltages. Our results provide insights into the complex physics of quantum dot devices used to probe Majorana bound states.
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spelling pubmed-102221492023-05-28 Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States Máthé, Levente Kovács-Krausz, Zoltán Botiz, Ioan Grosu, Ioan El Anouz, Khadija El Allati, Abderrahim Zârbo, Liviu P. Nanomaterials (Basel) Article We theoretically analyze phonon-assisted tunneling transport in a quantum dot side connected to a Majorana bound state in a topological superconducting nanowire. We investigate the behavior of the current through the dot, for a range of experimentally relevant parameters, in the presence of one long-wave optical phonon mode. We consider the current-gate voltage, the current-bias voltage and the current-dot–Majorana coupling characteristics under the influence of the electron–phonon coupling. In the absence of electron–phonon interaction, the Majorana bound states suppress the current when the gate voltage matches the Fermi level, but the increase in the bias voltage counteracts this effect. In the presence of electron–phonon coupling, the current behaves similarly as a function of the renormalized gate voltage. As an added feature at large bias voltages, it presents a dip or a plateau, depending on the size of the dot–Majorana coupling. Lastly, we show that the currents are most sensitive to, and depend non-trivially on the parameters of the Majorana circuit element, in the regime of low temperatures combined with low voltages. Our results provide insights into the complex physics of quantum dot devices used to probe Majorana bound states. MDPI 2023-05-11 /pmc/articles/PMC10222149/ /pubmed/37242032 http://dx.doi.org/10.3390/nano13101616 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Máthé, Levente
Kovács-Krausz, Zoltán
Botiz, Ioan
Grosu, Ioan
El Anouz, Khadija
El Allati, Abderrahim
Zârbo, Liviu P.
Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States
title Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States
title_full Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States
title_fullStr Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States
title_full_unstemmed Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States
title_short Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States
title_sort phonon-assisted tunneling through quantum dot systems connected to majorana bound states
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10222149/
https://www.ncbi.nlm.nih.gov/pubmed/37242032
http://dx.doi.org/10.3390/nano13101616
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