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Coherent charge oscillations in a bilayer graphene double quantum dot

The coherent dynamics of a quantum mechanical two-level system passing through an anti-crossing of two energy levels can give rise to Landau-Zener-Stückelberg-Majorana (LZSM) interference. LZSM interference spectroscopy has proven to be a fruitful tool to investigate charge noise and charge decohere...

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Autores principales: Hecker, K., Banszerus, L., Schäpers, A., Möller, S., Peters, A., Icking, E., Watanabe, K., Taniguchi, T., Volk, C., Stampfer, C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10689829/
https://www.ncbi.nlm.nih.gov/pubmed/38036517
http://dx.doi.org/10.1038/s41467-023-43541-3
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author Hecker, K.
Banszerus, L.
Schäpers, A.
Möller, S.
Peters, A.
Icking, E.
Watanabe, K.
Taniguchi, T.
Volk, C.
Stampfer, C.
author_facet Hecker, K.
Banszerus, L.
Schäpers, A.
Möller, S.
Peters, A.
Icking, E.
Watanabe, K.
Taniguchi, T.
Volk, C.
Stampfer, C.
author_sort Hecker, K.
collection PubMed
description The coherent dynamics of a quantum mechanical two-level system passing through an anti-crossing of two energy levels can give rise to Landau-Zener-Stückelberg-Majorana (LZSM) interference. LZSM interference spectroscopy has proven to be a fruitful tool to investigate charge noise and charge decoherence in semiconductor quantum dots (QDs). Recently, bilayer graphene has developed as a promising platform to host highly tunable QDs potentially useful for hosting spin and valley qubits. So far, in this system no coherent oscillations have been observed and little is known about charge noise in this material. Here, we report coherent charge oscillations and [Formula: see text] charge decoherence times in a bilayer graphene double QD. The charge decoherence times are measured independently using LZSM interference and photon assisted tunneling. Both techniques yield [Formula: see text] average values in the range of 400–500 ps. The observation of charge coherence allows to study the origin and spectral distribution of charge noise in future experiments.
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spelling pubmed-106898292023-12-02 Coherent charge oscillations in a bilayer graphene double quantum dot Hecker, K. Banszerus, L. Schäpers, A. Möller, S. Peters, A. Icking, E. Watanabe, K. Taniguchi, T. Volk, C. Stampfer, C. Nat Commun Article The coherent dynamics of a quantum mechanical two-level system passing through an anti-crossing of two energy levels can give rise to Landau-Zener-Stückelberg-Majorana (LZSM) interference. LZSM interference spectroscopy has proven to be a fruitful tool to investigate charge noise and charge decoherence in semiconductor quantum dots (QDs). Recently, bilayer graphene has developed as a promising platform to host highly tunable QDs potentially useful for hosting spin and valley qubits. So far, in this system no coherent oscillations have been observed and little is known about charge noise in this material. Here, we report coherent charge oscillations and [Formula: see text] charge decoherence times in a bilayer graphene double QD. The charge decoherence times are measured independently using LZSM interference and photon assisted tunneling. Both techniques yield [Formula: see text] average values in the range of 400–500 ps. The observation of charge coherence allows to study the origin and spectral distribution of charge noise in future experiments. Nature Publishing Group UK 2023-11-30 /pmc/articles/PMC10689829/ /pubmed/38036517 http://dx.doi.org/10.1038/s41467-023-43541-3 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Hecker, K.
Banszerus, L.
Schäpers, A.
Möller, S.
Peters, A.
Icking, E.
Watanabe, K.
Taniguchi, T.
Volk, C.
Stampfer, C.
Coherent charge oscillations in a bilayer graphene double quantum dot
title Coherent charge oscillations in a bilayer graphene double quantum dot
title_full Coherent charge oscillations in a bilayer graphene double quantum dot
title_fullStr Coherent charge oscillations in a bilayer graphene double quantum dot
title_full_unstemmed Coherent charge oscillations in a bilayer graphene double quantum dot
title_short Coherent charge oscillations in a bilayer graphene double quantum dot
title_sort coherent charge oscillations in a bilayer graphene double quantum dot
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10689829/
https://www.ncbi.nlm.nih.gov/pubmed/38036517
http://dx.doi.org/10.1038/s41467-023-43541-3
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