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Three-Carrier Spin Blockade and Coupling in Bilayer Graphene Double Quantum Dots

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2024

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Tong, Chuyao
Ginzel, Florian
Kurzmann, Annika
Garreis, Rebekka
Ostertag, Lara
Gerber, Jonas D.
Huang, Wei Wister
Watanabe, Kenji
Taniguchi, Takashi
Burkard, Guido

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Physical Review Letters. American Physical Society (APS). 2024, 133(1), 017001. ISSN 0031-9007. eISSN 1079-7114. VerfĂĽgbar unter: doi: 10.1103/physrevlett.133.017001

Zusammenfassung

The spin degrees of freedom is crucial for the understanding of any condensed matter system. Knowledge of spin-mixing mechanisms is not only essential for successful control and manipulation of spin qubits, but also uncovers fundamental properties of investigated devices and material. For electrostatically defined bilayer graphene quantum dots, in which recent studies report spin-relaxation times 𝑇1 up to 50 ms with strong magnetic field dependence, we study spin-blockade phenomena at charge configuration (1,2)↔(0,3). We examine the dependence of the spin-blockade leakage current on interdot tunnel coupling and on the magnitude and orientation of externally applied magnetic field. In out-of-plane magnetic field, the observed zero-field current peak could arise from finite-temperature cotunneling with the leads; though involvement of additional spin- and valley-mixing mechanisms are necessary for explaining the persistent sharp side peaks observed. In in-plane magnetic field, we observe a zero-field current dip, attributed to the competition between the spin Zeeman effect and the Kane-Mele spin-orbit interaction. Details of the line shape of this current dip, however, suggest additional underlying mechanisms are at play.

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ISO 690TONG, Chuyao, Florian GINZEL, Annika KURZMANN, Rebekka GARREIS, Lara OSTERTAG, Jonas D. GERBER, Wei Wister HUANG, Kenji WATANABE, Takashi TANIGUCHI, Guido BURKARD, 2024. Three-Carrier Spin Blockade and Coupling in Bilayer Graphene Double Quantum Dots. In: Physical Review Letters. American Physical Society (APS). 2024, 133(1), 017001. ISSN 0031-9007. eISSN 1079-7114. VerfĂĽgbar unter: doi: 10.1103/physrevlett.133.017001
BibTex
@article{Tong2024-07-02Three-70539,
  year={2024},
  doi={10.1103/physrevlett.133.017001},
  title={Three-Carrier Spin Blockade and Coupling in Bilayer Graphene Double Quantum Dots},
  number={1},
  volume={133},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Tong, Chuyao and Ginzel, Florian and Kurzmann, Annika and Garreis, Rebekka and Ostertag, Lara and Gerber, Jonas D. and Huang, Wei Wister and Watanabe, Kenji and Taniguchi, Takashi and Burkard, Guido},
  note={Article Number: 017001}
}
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