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Journal of Nanomaterials
Volume 2015, Article ID 810659, 10 pages
http://dx.doi.org/10.1155/2015/810659
Research Article

Symmetry-Dependent Spin Transport Properties and Spin-Filter Effects in Zigzag-Edged Germanene Nanoribbons

1School of Physics and Electronics, Central South University, Changsha 410083, China
2School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

Received 26 March 2015; Revised 2 July 2015; Accepted 5 July 2015

Academic Editor: Christian Brosseau

Copyright © 2015 Can Cao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We performed the first-principles calculations to investigate the spin-dependent electronic transport properties of zigzag-edged germanium nanoribbons (ZGeNRs). We choose of ZGeNRs with odd and even widths of 5 and 6, and the symmetry-dependent transport properties have been found, although the mirror plane is absent in ZGeNRs. Furthermore, even- and odd- ZGeNRs have very different current-voltage relationships. We find that the even 6-ZGeNR shows a dual spin-filter effect in antiparallel (AP) magnetism configuration, but the odd 5-ZGeNR behaves as conventional conductors with linear current-voltage dependence. It is found that when the two electrodes are in parallel configuration, the 6-ZGeNR system is in a low resistance state, while it can switch to a much higher resistance state when the electrodes are in AP configuration, and the magnetoresistance of 270% can be observed.