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Your search keyword '"Song, Zhigang"' showing total 9 results
Start Over Author "Song, Zhigang" Journal nanoscale
9 results on '"Song, Zhigang"'

6. Does p-type ohmic contact exist in WSe2–metal interfaces?

Author

Wang, Yangyang, primary, Yang, Ruo Xi, additional, Quhe, Ruge, additional, Zhong, Hongxia, additional, Cong, Linxiao, additional, Ye, Meng, additional, Ni, Zeyuan, additional, Song, Zhigang, additional, Yang, Jinbo, additional, Shi, Junjie, additional, Li, Ju, additional, and Lu, Jing, additional

Published
2016
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9. Phase transition and topological transistors based on monolayer Na 3 Bi nanoribbons.

Author

Shi B, Tang H, Song Z, Li J, Xu L, Liu S, Yang J, Sun X, Quhe R, Yang J, and Lu J

Abstract

Recently, a topological-to-trivial insulator quantum-phase transition induced by an electric field has been experimentally reported in monolayer (ML) and bilayer (BL) Na 3 Bi. A narrow ML/BL Na 3 Bi nanoribbon is necessary to fabricate a high-performance topological transistor. By using the density functional theory method, we found that wider ML Na 3 Bi nanoribbons (>7 nm) are topological insulators, featured by insulating bulk states and dissipationless metallic edge states. However, a bandgap is opened for extremely narrow ML Na 3 Bi nanoribbons (<4 nm) due to the quantum confinement effect, and its size increases with the decrease in width. In the topological insulating ML Na 3 Bi nanoribbons, a bandgap is opened in the metallic edge states under an external displacement electric field, with strength (∼1.0 V Å -1 ) much smaller than the reopened displacement electric field in ML Na 3 Bi (3 V Å -1 ). An ultrashort ML Na 3 Bi zigzag nanoribbon topological transistor switched by the electrical field was calculated using first-principles quantum transport simulation. It shows an on/off current/conductance ratio of 4-71 and a large on-state current of 1090 μA μm -1 . Therefore, a proof of the concept of topological transistors is presented.

Published
2021
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