Creating custom-designed patterns of nanoscale graphene quantum dots

Graphene quantum dots (GQDs) have attracted extensive attention over the years because of their importance both in fundamental science and potential applications. However, fabricating patterns of the GQDs is still of great challenge in experiment. Here, we demonstrate a technique to create patterned...

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Bibliographic Details
Published in:2d materials 2022-04, Vol.9 (2), p.21002
Main Authors: Yang, Qian, Zhang, Yu, Fu, Zhong-Qiu, Chen, Yulong, Di, Zengfeng, He, Lin
Format: Article
Language:English
Subjects:
custom-designed patterns
graphene
pulse voltage
quantum dot
scanning tunneling microscopy
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Summary:Graphene quantum dots (GQDs) have attracted extensive attention over the years because of their importance both in fundamental science and potential applications. However, fabricating patterns of the GQDs is still of great challenge in experiment. Here, we demonstrate a technique to create patterned nanometer-sized GQDs with nanoscale precision in their sites. By applying a voltage pulse from a scanning tunneling microscopy (STM) tip, we successfully create stationary nanoscale circular p–n junctions, i.e. GQDs, in a continuous graphene sheet on hydrogen terminated germanium (110) surface. With accurately tuning the coordinates of the STM tip, the designed patterns of the GQDs are successfully generated. Spatial-resolved measurements indicate that the patterns of the GQDs strongly affect the local electronic properties and two-dimensional distributions of local density of states in graphene.
ISSN:2053-1583
2053-1583
DOI:10.1088/2053-1583/ac4e71