| AVS 58th Annual International Symposium and Exhibition | |
| Graphene and Related Materials Focus Topic | Thursday Sessions |
| Session GR+TF+NS-ThA |
| Session: | Graphene Nanoribbons and Related Structures |
| Presenter: | Joseph Driscoll, Vanderbilt University |
| Authors: | J. Driscoll, Vanderbilt University K. Varga, Vanderbilt University |
| Correspondent: | Click to Email |
A real-space, real-time implementation of time-dependent density functional theory [1,2,3] is used to study electron field emission from graphene nanoribbons. The structures are shown to be good field emitters with spatial variation of the emission current influenced by the presence of passivating hydrogen. The nanoribbons are seen to produce slightly lower currents than nanotubes formed from the ribbons. Spin-polarized field emission from carbon nanotubes has been calculated with and without Fe adsorbates (atoms and clusters). It was observed that various adsorbates cause the separation of density into spin-polarized regions. The calculations predict that carbon nanotubes with various adsorbates can be used as spin-polarized current sources. The spin-polarized results for nanotubes will be compared to similar
calculations for graphene nanoribbons.
References
[1] J.A. Driscoll and K.Varga, Phys. Rev. B 80, 245431 (2009).
[2] J.A. Driscoll, S. Bubin, W. French, and K. Varga (submitted).
[3] J.A. Driscoll, B. Cook, S. Bubin, and K. Varga (submitted).
Acknowledgments
This work is supported by NSF grant CMMI0927345.