51. The influence of coupling between chains on the conductivity of atomic carbon chains.
- Author
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Liang, Zhewen, Xu, Xiaodong, Jiang, Yingjie, Li, Weiqi, Wang, Qiang, Zhang, Guiling, Tian, Wei Quan, and Jiang, Yongyuan
- Subjects
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SPIN valves , *GREEN'S functions , *FIELD-effect transistors , *SPIN polarization , *DENSITY functional theory , *ELECTRON density - Abstract
This work presents a theoretical investigation on the electronic properties of double atomic carbon chains bridging graphene electrodes with density functional theory in combination with non-equilibrium Green's function. The influence of strain on the conductance of atomic carbon chains is significant. However, the coupling effect between adjacent chains dominates the intrinsic transport of double atomic carbon chains. For the coupled double atomic chains, the electron conductance of even-numbered atomic chains is significantly enhanced, while the electron conductance of odd-numbered atomic chains decreases to a certain degree, and the dependence of the conductance of double atomic chains on electrode configuration is stronger than the corresponding single atomic chain. More intriguingly, the coupled double atomic chains exhibit excellent spin-filtering properties with antiparallel spins on two electrodes. The current spin polarization stems from the coupling-induced changes of electron density and band offset reaches 100%. The coupled double atomic carbon chains have great potential application in spintronic devices and carbon-based field-effect transistors. • Coupling of carbon atomic chains increase the average conductance of atomic chains. • Coupling of carbon atomic chains induces very strong spin filter effect, even reaches 100%. • MR ratios of double carbon atomic chains increase by up to 5 orders of magnitude of the single carbon atomic chain. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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