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
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.
(Electronic transport in nanoscale materials and structures)
Fund: 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).
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 2023 Chin. Phys. B 32 077202
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