钻石
石墨烯
空位缺陷
材料科学
氮气
电流(流体)
图像分辨率
纳米技术
光电子学
凝聚态物理
化学
光学
物理
热力学
冶金
有机化学
作者
Cheng Zhong,Yupeng Wang,Di Mai,Chunhui Ye,Xiangdong Li,He Wang,Rucheng Dai,Zhongping Wang,Xiaoyu Sun,Zengming Zhang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-04-15
标识
DOI:10.1021/acs.nanolett.4c00780
摘要
Current density imaging is helpful for discovering interesting electronic phenomena and understanding carrier dynamics, and by combining pressure distributions, several pressure-induced novel physics may be comprehended. In this work, noninvasive, high-resolution two-dimensional images of the current density and pressure gradient for graphene ribbon and hBN-graphene-hBN devices are explored using nitrogen-vacancy (NV) centers in diamond under high pressure. The two-dimensional vector current density is reconstructed by the vector magnetic field mapped by the near-surface NV center layer in the diamond. The current density images accurately and clearly reproduce the complicated structure and current flow of graphene under high pressure. Additionally, the spatial distribution of the pressure is simultaneously mapped, rationalizing the nonuniformity of the current density under high pressure. The current method opens a significant new avenue to investigate electronic transport and conductance variations in two-dimensional materials and electrical devices under high pressure as well as for nondestructive evaluation of semiconductor circuits.
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