期刊
NANO RESEARCH
卷 3, 期 8, 页码 545-556出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-010-0015-7
关键词
Graphene; graphene nanoribbons (GNRs); band gap; strain; first-principles calculations; tight-binding model
类别
资金
- National Natural Science Foundation of China [50821061, 20973013]
- Ministry of Science and Technology of China [2007CB936203]
- Fundamental Research Funds for the Central Universities
A tight-binding analytic framework is combined with first-principles calculations to reveal the mechanism underlying the strain effects on electronic structures of graphene and graphene nanoribbons (GNRs). It provides a unified and precise formulation of the strain effects under various circumstances-including the shift of the Fermi (Dirac) points, the change in band gap of armchair GNRs with uniaxial strain in a zigzag pattern and its insensitivity to shear strain, and the variation of the k-range of edge states in zigzag GNRs under uniaxial and shear strains which determine the gap behavior via the spin polarization interaction.
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