English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Controlling the forbidden gap of graphene nano-ribbons (GNR) is a majorchallenge that has to be attained if this attractive material has to be used inmicro- and nano-electronics. Using an unambiguous notation {m,n}-GNR, where m(n) is the number of six carbon rings in the arm-chair (zig-zag) directions, weinvestigate how varies the HOMO-LUMO gap when the size of the GNR is varied byincreasing either m or n, while keeping the other variable fixed. It is shownthat no matter whether charge- or spin-density-waves solutions are considered,the gap varies smoothly when n is kept fixed whereas it oscillates when theopposite is done, posing serious difficulties to the control of the gap. It isargued that the origin of this behavior is the fact that excess or defectcharges or magnetic moments are mostly localized at zig-zag edges.

Graphene Nano-Ribbons: Major differences in the fundamental gap as its length is increased either in the zig-zag or the armchair directions