A valley-filtering switch based on the Stone-Wales defect array in carbon nanotube
National Laboratory of Superhard Materials, Department of Physics, Jilin University Changchun 130012, China
Received: 25 May 2013
Accepted: 20 August 2013
We theoretically demonstrate that valley-filtering switch can be realized in a carbon nanotube (CNT) embedded with a series of Stone-Wales defects. It is due to the fact that such a CNT shows two peculiar subbands which span two Dirac valleys without nontrivial dispersion, just like the flat-bottomed subbands of a zigzag-edged graphene nanoribbon. Considering that similar defects have been experimentally patterned in a CNT in a controllable way, this kind of CNT is a promising device prototype for valleytronic applications.
PACS: 73.63.-b – Electronic transport in nanoscale materials and structures / 72.10.Fk – Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect) / 84.30.Vn – Filters
© EPLA, 2013