Bonding and Magnetism in High Symmetry Nano-Sized Graphene Molecules: Linear Acenes C<SUB>4<I>m</I>+2</SUB>H<SUB>2<I>m</I>+4</SUB> (<I>m</I>=2,&hellip;25); Zigzag Hexangulenes C<SUB>6<I>m</I><SUP>**</SUP>2</SUB>H<SUB>6<I>m</I></SUB> (<I>m</I>=2,&hellip;10); Crenelated Hexangulenes C<SUB>6(3<I>m</I><SUP>**</SUP>2&minus;3<I>m</I>+1)</SUB>H<SUB>6(2<I>m</I>&minus;1)</SUB> (<I>m</I>=2,&hellip;6); Zigzag Triangulenes C<SUB><I>m</I><SUP>**</SUP>2+4<I>m</I>+1</SUB>H<SUB>6<I>m</I></SUB> (<I>m</I>=2,&hellip;15)

Towards intrinsic magnetism of graphene sheets with irregular zigzag edges

The magnetism of graphene has remained divergent and controversial due to absence of reliable experimental results. Here we show the intrinsic magnetism of graphene edge states revealed based on unidirectional aligned graphene sheets derived from completely carbonized SiC crystals. It is found that ferromagnetism, antiferromagnetism and diamagnetism along with a probable superconductivity exist...

Electron spin magnetism of zigzag graphene nanoribbon edge states

Heterospin Junctions in Zigzag-Edged Graphene Nanoribbons

We propose a graphene nanoribbon-based heterojunction, where a defect-free interface separates two zigzag graphene nanoribbons prepared in opposite antiferromagnetic spin configurations. This heterospin junction is found to allow the redirecting of low-energy electrons from one edge to the other. The basic scattering mechanisms and their relation to the system’s geometry are investigated throug...

Zigzag codes and concatenated zigzag codes

This paper introduces a family of error-correcting codes called zigzag codes. A zigzag code is described by a highly structured zigzag graph. Due to the structural properties of the graph, very low-complexity soft-in/soft-out decoding rules can be implemented. We present a decoding rule, based on the Max-Log-APP (MLA) formulation, which requires a total of only 20 addition-equivalent operations...

Selective scattering in a zigzag graphene nanoribbon

Electric transport of a zigzag graphene nanoribbon through a step-like potential or a potential barrier is studied by using the recursive Green’s function method. The results for a step-like potential show that scattering processes in a zigzag graphene nanoribbon obey a following selection rule: when the number of zigzag chains N is even, electrons in the band m are only scattered into the band...