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説明:

The coherent dynamics of a quantum mechan- ical two-level system driven through an anti- crossing of two energy levels can be described using Landau-Zener-Stu ̈ckelberg (LZS) interfer- ence. LZS interference spectroscopy has proven to be a fruitful tool to investigate charge noise and charge decoherence in semiconductor quan- tum 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 no charge coherence has been observed and little is known about charge noise in this material. Here, we report coher- ent charge oscillations and T2∗ charge decoherence times in a bilayer graphene double QD. The charge decoherence times are measured indepen- dently using LZS interference and photon assisted tunneling and both techniques yield values in the range of 400 to 500 ps. The observation of charge coherence allows studying the origin and spec- tral distribution of charge noise in future experiments.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Landau-Zener-Stückelberg-Majorana interference, bilayer graphene, charge decoherence

刊行年月日: 2023-11-30

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 14 issue. 1 7911

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-023-43541-3

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更新時刻: 2025-02-10 16:30:35 +0900

MDRでの公開時刻: 2025-02-10 16:30:35 +0900