Strong current polarization and negative differential resistance in chiral graphene nanoribbons with reconstructed (2,1)-edges
2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 101, no 7, 073101- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2012. Vol. 101, no 7, 073101- p.
IdentifiersURN: urn:nbn:se:kth:diva-103977DOI: 10.1063/1.4745506ISI: 000308263100052ScopusID: 2-s2.0-84865409561OAI: oai:DiVA.org:kth-103977DiVA: diva2:562786
QC 201210262012-10-262012-10-252013-01-23Bibliographically approved