Magnetism induced by excess electrons trapped at diamagnetic edge-quantum well in multi-layer graphene

• Main Authors: Zhang, Xi, Wang, Chao, Diao, Dongfeng, Sun, Chang Qing
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/104885; http://hdl.handle.net/10220/20367; http://dx.doi.org/10.1063/1.4891558
• Institution: Nanyang Technological University

In this paper, we clarified a robust mechanism of magnetism generated by excess electrons captured by edge-quantum well of diamagnetic armchair edges. Consistency between density functional theory calculations and electron cyclotron resonance experiments verified that: (1) Multi-layer armchair nanoribbons are stable with proper amounts of excess electrons which can provide net spin; (2) Since under-coordination induces lattice relaxation and potential well modulation, electrons tend to be trapped at edges; and (3) Neither large amount of excess electrons nor positive charges can induce magnetism. This work shed light on the development of graphene devices in its magnetic applications.