Volume 105, Number 5, March 2014
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 March 2014|
Perfect spin filter and strong current polarization in carbon atomic chain with asymmetrical connecting points
1 School of Physics and Microelectronic and Key Laboratory for Micro- Nano Physics and Technology of Hunan Province, Hunan University - Changsha 410082, PRC
2 School of Optoelectronic Information, University of Electronic Science and Technology of China Chengdu, Sichuan, 610054, PRC
3 Department of Electrical and Information Engineering, Hunan Institute of Engineering - Xiangtan 411101, PRC
Received: 18 January 2014
Accepted: 27 February 2014
The spin-dependent electron transport properties through a single-carbon atomic chain (SCAC) sandwiched between two-zigzag-graphene-nanoribbon (zGNR) electrodes are investigated by performing first-principles calculations based on the nonequilibrium Green's function (NEGF) approach in combination with spin density functional theory (DFT). Our calculations show that SCAC connecting two zGNRs with asymmetry-contacting points is a perfect spin filter in the transmission function within a large energy range. Moreover, the spin-dependent electron transmission spectra exhibit robust transport polarization characteristics and a strong current polarization behavior (almost 100%) can be found. The microscopic mechanisms are proposed for the spin-related phenomena.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 85.65.+h – Molecular electronic devices / 73.21.Hb – Quantum wires
© EPLA, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.