Armchair graphene nanoribbon-based spin caloritronics

Armchair graphene nanoribbons are considered unsuitable for spin caloritronic applications, due to the lack of intrinsic magnetism. Inspired by progress on fabricating carbon nanotubes with Janus edges Bets et al. (2019) [26], we construct edges, where one edge is armchair type and other possesses triangular protrusions zigzag-armchair or zigzag-zigzag sub-edges. By first-principles calculations, Spin Seebeck effect found. Further analysis shows that, it resulted from difference Fermi distributions between two electrodes, which triggered temperature difference, peculiar transmission spectra, peaks opposite spins reside discretely both sides EF. These contributed corresponding bands above below EF respectively, induced We believe our findings would be useful in developing graphene-based caloritronics.