Strong current polarization and negative differential resistance in chiral graphene nanoribbons with reconstructed (2,1)-edges

作者：Li, Xiao-Fei^*; Wang, Ling-Ling; Chen, Ke-Qiu; Luo, Yi

来源：Applied Physics Letters, 2012, 101(7): 073101.

DOI：10.1063/1.4745506

• TRANSPORT-PROPERTIES
• EDGE STATES
• STABILITY

We investigate electronic structures and transport properties of chiral-graphene-nanoribbons (CGNRs) with reconstructed (2,1)-edges. First principles results reveal that the (2,1)-CGNRs can be either spin non-polarized or polarized, depending on whether the edges are H-saturated or unsaturated. H-saturated systems are semiconductors with width-dependent transmission gap, while unsaturated systems are metallic at non-polarized state or at antiferromagnetic state and they are semiconductors at ferromagnetic state. Moreover, unsaturated systems possess strong current polarizations (nearly 100%) and a striking negative differential resistance behavior (with a peak-to-valley ratio about 105). These remarkable properties suggest the potential application of (2,1)-CGNRs in molectronics and spintronics.

• 出版日期2012-8-13
• 单位湖南大学