TY - JOUR
T1 - Scalable fabrication of graphene nanoribbon quantum dot devices with stable orbital-level spacing
AU - Kato, Toshiaki
AU - Kitada, Takahito
AU - Seo, Mizuki
AU - Okita, Wakana
AU - Sato, Naofumi
AU - Shinozaki, Motoya
AU - Abe, Takaya
AU - Kumasaka, Takeshi
AU - Aizawa, Takumi
AU - Muto, Yui
AU - Kaneko, Toshiro
AU - Otsuka, Tomohiro
N1 - Funding Information:
This work was supported in part by Scientific Research A (grant no. 19H00664), JSPS Transformative Research Areas (A) “Science of 2.5 Dimensional Materials” program (22H05441), MEXT Leading Initiative for Excellent Young Researchers, Grants-in-Aid for Scientific Research (grant no. 20J14418 and 21K18592) from JSPS KAKENHI, JST-PRESTO (grant no. J170002074 and JPMJPR16N3), JSPS A3 Foresight Program (“2D Materials and van der Waals Heterostructures”), Sumitomo Foundation Fiscal 2021 Grant for Basic Science Research Projects, Yazaki Memorial Foundation for Science and Technology, Mitsubishi Foundation, Takahashi Industrial and Economic Research Foundation Research Grant, The Murata Science Foundation Research Grant, Izumi Science and Technology Foundation Research Grant, Fujikura Foundation Research Grant, and FRiD Tohoku University and the Cooperative Research Project Program of the Research Institute of Electrical Communication, Tohoku University. We thank T. Johmen and RIEC Fundamental Technology Center for fruitful discussions and technical support.
Publisher Copyright:
© 2022, The Author(s).
PY - 2022/12
Y1 - 2022/12
N2 - Large-scale integration of quantum-dot devices is essential for realizing various quantum devices. Graphene-based quantum dots provide a promising platform for spin qubits because of their low nuclear spin density and weak spin-orbit interaction. However, the integration of graphene-based quantum dots remains a challenge. Here, we demonstrate the scalable fabrication of graphene nanoribbon-based quantum-dot devices using a nickel nanobar technique. Fine structures formed in the middle of the nanoribbons exhibit quantum-dot behavior, and more than 56% of devices fabricated on the same substrate show Coulomb diamond features, indicating that large-scale integration of graphene nanoribbon quantum-dot devices is possible with our method. Cryogenic measurements reveal orbital-level spacings between the ground and excited states that are stable up to high-temperature conditions of ~20 K. We explain this stability in terms of the very fine structures formed in the middle of the nanoribbons and their relatively low effective mass.
AB - Large-scale integration of quantum-dot devices is essential for realizing various quantum devices. Graphene-based quantum dots provide a promising platform for spin qubits because of their low nuclear spin density and weak spin-orbit interaction. However, the integration of graphene-based quantum dots remains a challenge. Here, we demonstrate the scalable fabrication of graphene nanoribbon-based quantum-dot devices using a nickel nanobar technique. Fine structures formed in the middle of the nanoribbons exhibit quantum-dot behavior, and more than 56% of devices fabricated on the same substrate show Coulomb diamond features, indicating that large-scale integration of graphene nanoribbon quantum-dot devices is possible with our method. Cryogenic measurements reveal orbital-level spacings between the ground and excited states that are stable up to high-temperature conditions of ~20 K. We explain this stability in terms of the very fine structures formed in the middle of the nanoribbons and their relatively low effective mass.
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U2 - 10.1038/s43246-022-00326-3
DO - 10.1038/s43246-022-00326-3
M3 - Article
AN - SCOPUS:85145018551
SN - 2662-4443
VL - 3
JO - Communications Materials
JF - Communications Materials
IS - 1
M1 - 103
ER -