期刊
ORGANIC ELECTRONICS
卷 15, 期 1, 页码 65-70出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2013.10.022
关键词
Trigonal graphene; Carbon chain; Spin polarization; Half-metallicity
资金
- National Natural Science Foundation of China [61371065, 61071015, 61101009, 61201080]
- Construct Program of the Key Discipline in Hunan Province
- Scientific Research Fund of Hunan Provincial Education Department [12A001]
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Instituions of Hunan Province
- Scientific Research Innovation Fund for Postgraduate of Changsha University of Science and Technology
- Hunan Provincial Innovation Foundation for Postgraduate [CX2013B379]
The spin polarization property of a zigzag-edge trigonal graphene (ZTG) linked with different-length carbon chains C-n is investigated theoretically. It has been found that the enhancement of such a property completely depends on that the number of carbon atoms in a chain being odd or even. If it is an even number, the spin polarization is only changed slightly due to the nearly nonmagnetic property of these carbon chains. In contrast, while it is an odd number, the spin polarization is enhanced significantly to a larger energy range, i.e., showing a prominent half-metallicity and perfect spin-filter effects, owing to interactions of the ZTG and carbon chains with the strong ferromagnetism property. Deepgoing analyses show that these results are intimately related to a polyyne-like configuration for carbon chains in nanojunctions and the transition from the bipolar magnetic semiconductor to half-metallicity. Our findings suggest that this simple structure might promise importantly potential applications for developing nano-scale spintronics devices. (C) 2013 Elsevier B.V. All rights reserved.
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