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We report on an experimental study of spin and valley blockade in two-electron bilayer graphene (BLG) double quantum dots (DQDs) and explore the limits set by asymmetric orbitals and electron- electron interactions. The results obtained from magnetotransport measurements on two-electron BLG DQDs, where the resonant tunneling transport involves both orbital symmetric and antisymmetric two-particle states, show a rich level spectrum. We observe a magnetic field tunable spin and valley blockade, which is limited by the orbital splitting, the strength of the electron-electron interaction and the difference in the valley g-factors between the symmetric and antisymmetric two- particle orbital states. Our conclusions are supported by simulations based on rate equations, which allow the identification of prominent interdot transitions associated with the transition from single to two-particle states observed in the experiment.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: graphene double quantum dots, spin and valley blockade, electron-electron interactions


Date published: 2025-04-18

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 1550235X) vol. 111 issue. 16 165416

Funding:

• H2020 European Research Council 820254
• Deutsche Forschungsgemeinschaft EXC 2004/1 - 390534769
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052

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

MDR DOI:

First published URL: https://doi.org/10.1103/physrevb.111.165416

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Updated at: 2026-05-25 08:58:28 +0900

Published on MDR: 2026-05-25 10:29:21 +0900