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Electron transport through the p-n junction of zigzag graphene nanoribbon with external transverse electric fields

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2 Author(s)
Zhu, Wen-Huan ; Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China ; Ding, Guo-Hui

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We study the electron transport properties of the p-n junction based on zigzag graphene nanoribbon, including its magnetic moment, charge-density distribution, and also the spin-resolved transmission probability. A nanoscale system of width ≈2 nm and length ≈15 nm is considered. It is shown that the magnetization of the edges is quenched in the p and n regions, but can be preserved in the center part of the p-n junction. We find that the electrons can tunnel through the junction by the localized modes, which exist at the interface of the p and n regions. In the presence of external transverse electric fields, we show that the electron current through the p-n junction will be spin-polarized when the zigzag graphene nanoribbon is in a half-metal state, and the current is switched off when a charge-polarized state is obtained.

Published in:

Journal of Applied Physics  (Volume:110 ,  Issue: 11 )