Controlled crossover of electron transport in graphene nanoconstriction: From Coulomb blockade to electron interference

doi:10.1088/1674-1056/accf67

中国物理B ›› 2023, Vol. 32 ›› Issue (7): 77202-077202.doi: 10.1088/1674-1056/accf67

Controlled crossover of electron transport in graphene nanoconstriction: From Coulomb blockade to electron interference

Wei Yu(余炜)^1,2, Xiao Guo(郭潇)^1,2, Yuwen Cai(蔡煜文)^1,2, Xiaotian Yu(俞晓天)^1,2, and Wenjie Liang(梁文杰)^1,2,†

1 Beijing National Center for Condensed Matter Physics, Beijing Key Laboratory for Nanomaterials and Nanodevices, Institute of Physics, Chinese Academy of Sciences(CAS), Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2023-03-16 修回日期:2023-04-12 接受日期:2023-04-22 出版日期:2023-06-15 发布日期:2023-07-10
通讯作者: Wenjie Liang E-mail:wjliang@iphy.ac.cn
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2016YFA0200800), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDB30000000 and XDB07030100), and the Sinopec Innovation Scheme (Grant No. A-527).

Controlled crossover of electron transport in graphene nanoconstriction: From Coulomb blockade to electron interference

Wei Yu(余炜)^1,2, Xiao Guo(郭潇)^1,2, Yuwen Cai(蔡煜文)^1,2, Xiaotian Yu(俞晓天)^1,2, and Wenjie Liang(梁文杰)^1,2,†

1 Beijing National Center for Condensed Matter Physics, Beijing Key Laboratory for Nanomaterials and Nanodevices, Institute of Physics, Chinese Academy of Sciences(CAS), Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China

Received:2023-03-16 Revised:2023-04-12 Accepted:2023-04-22 Online:2023-06-15 Published:2023-07-10
Contact: Wenjie Liang E-mail:wjliang@iphy.ac.cn
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2016YFA0200800), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDB30000000 and XDB07030100), and the Sinopec Innovation Scheme (Grant No. A-527).

摘要/Abstract

摘要： The ability to control transport behaviors in nanostructure is crucial for usage as a fundamental research platform as well as a practical device. In this study, we report a gate-controlled crossover of electron transport behaviors using graphene nanoconstrictions as a platform. The observed transport properties span from Coulomb blockade-dominated single electron transmission to electron-wave interference-dominated quantum behavior. Such drastic modulation is achieved by utilizing a single back gate on a graphene nanoconstriction structure, where the size of nanostructure in the constriction and coupling strength of it to the electrodes can be tuned electrically. Our results indicate that electrostatic field by gate voltage upon the confined nanostructure defines both the size of the nanoconstriction as well as its interaction to electrodes. Increasing gate voltage raises Fermi level to cross the energy profile in the nanoconstriction, resulting in decreased energy barriers which affect the size of nanoconstriction and transmissivity of electrons. The gate-tunable nanoconstriction device can therefore become a potential platform to study quantum critical behaviors and enrich electronic and spintronic devices.

关键词: graphene nanoconstriction, Coulomb blockade, electron interference, gate-tunable

Abstract: The ability to control transport behaviors in nanostructure is crucial for usage as a fundamental research platform as well as a practical device. In this study, we report a gate-controlled crossover of electron transport behaviors using graphene nanoconstrictions as a platform. The observed transport properties span from Coulomb blockade-dominated single electron transmission to electron-wave interference-dominated quantum behavior. Such drastic modulation is achieved by utilizing a single back gate on a graphene nanoconstriction structure, where the size of nanostructure in the constriction and coupling strength of it to the electrodes can be tuned electrically. Our results indicate that electrostatic field by gate voltage upon the confined nanostructure defines both the size of the nanoconstriction as well as its interaction to electrodes. Increasing gate voltage raises Fermi level to cross the energy profile in the nanoconstriction, resulting in decreased energy barriers which affect the size of nanoconstriction and transmissivity of electrons. The gate-tunable nanoconstriction device can therefore become a potential platform to study quantum critical behaviors and enrich electronic and spintronic devices.

Key words: graphene nanoconstriction, Coulomb blockade, electron interference, gate-tunable

中图分类号: (Electronic transport in graphene)

72.80.Vp

73.23.-b (Electronic transport in mesoscopic systems) 73.23.Hk (Coulomb blockade; single-electron tunneling) 73.63.-b (Electronic transport in nanoscale materials and structures)

Wei Yu(余炜), Xiao Guo(郭潇), Yuwen Cai(蔡煜文), Xiaotian Yu(俞晓天), and Wenjie Liang(梁文杰). Controlled crossover of electron transport in graphene nanoconstriction: From Coulomb blockade to electron interference[J]. 中国物理B, 2023, 32(7): 77202-077202.

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Controlled crossover of electron transport in graphene nanoconstriction: From Coulomb blockade to electron interference

Controlled crossover of electron transport in graphene nanoconstriction: From Coulomb blockade to electron interference

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