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arXiv 2103.16097cond-mat.mes-hallcond-mat.mtrl-sci
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量子电容诱导的石墨烯非局域静电门效应

Quantum Capacitance Induced Non-Local Electrostatic Gating Effect in Graphene

Aolin Deng, Cheng Hu, Peiyue Shen, Xingdong Luo, Jiajun Chen, Bosai Lyu, Kenji Watanabe, Takashi Taniguchi, Qi Liang, Jie Ma, Zhiwen Shi

摘要:

静电门控是现代FET集成电路的核心。通常,为了实现有效的可调谐性,栅电极必须非常靠近导电沟道放置,通常为几纳米。然而,通过放置在远处的栅电极对FET器件的遥控总是非常期望的,因为它不仅降低了器件制造的复杂性,而且能够设计具有新功能的新颖器件。在这里,一个非本地门效应在石墨烯使用近场光学纳米成像和电输运测量报告。在吸附水分子的辅助下,石墨烯的电荷密度可以通过放置在30 μm以上的局域门来有效地调节。所观察到的非局部门控效应最初由在石墨烯中的狄拉克点附近的量子电容导致的具有不同电荷密度的石墨烯区域之间建立的平面内电场驱动。吸附水分子通过屏蔽面内电场和延长跃迁长度,进一步放大和增强了非定域性。该研究揭示了狄拉克电子的非定域现象,为利用二维小态密度材料设计远程控制电子器件奠定了基础。

英文摘要:

Electrostatic gating lies in the heart of modern FET-based integrated circuits. Usually, the gate electrode has to be placed very close to the conduction channel, typically a few nanometers, in order to achieve efficient tunability. However, remote control of a FET device through a gate electrode placed far away is always highly desired, because it not only reduces the complexity of device fabrication, but also enables designing novel devices with new functionalities. Here, a non-local gating effect in graphene using both near-field optical nano-imaging and electrical transport measurement is reported. With assistance of absorbed water molecules, the charge density of graphene can be efficiently tuned by a local-gate placed over 30 μm away. The observed non-local gating effect is initially driven by an in-plane electric field established between graphene regions with different charge densities due to the quantum capacitance near the Dirac point in graphene. The nonlocality is further amplified and largely enhanced by absorbed water molecules through screening the in-plane electric field and expending the transition length. This research reveals novel non-local phenomenon of Dirac electrons, and paves the way for designing electronic devices with remote-control using 2D materials with small density of states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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