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Description:

The relaxation time of a single-electron spin is a key parameter for solid-state spin qubits, as it directly limits the lifetime of the encoded information. Thanks to the low spin-orbit interaction and low hyperfine coupling, graphene and bilayer graphene (BLG) have long been considered promising platforms for spin qubit. Only recently, it has become possible to control single-electrons in BLG quantum dots (QDs) and to understand their spin-valley texture, while the relaxation dynamics have remained mostly unexplored. Here, we report spin relaxation times (T1) of single-electron states in BLG QDs. Using pulsed-gate spectroscopy, we extract relaxation times exceeding 200 μs at a magnetic field of 1.9 T. The T1 values show a strong dependence on the spin splitting, promising even longer T1 at lower magnetic fields, where our measurements are limited by the signal-to-noise ratio. The relaxation times are more than two orders of magnitude larger than those previously reported for carbon-based QDs, confirming that graphene is a promising host material for scalable spin qubits.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Spin relaxation, bilayer graphene, quantum dots

Date published: 2022-06-25

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 13 issue. 1 3637

Funding:

• Deutsche Forschungsgemeinschaft 390534769

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-022-31231-5

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Updated at: 2025-02-27 08:31:05 +0900

Published on MDR: 2025-02-27 08:31:05 +0900