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Study of electronic and magnetic excitations in the 2D materials 石墨烯毕业论文
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《Study of electronic and magnetic excitations in the 2D materials represented by graphene and magnetic nano-ribbons》The discovery of graphene - a 2D material with superior physical properties - in 2004 is an important part of the intensive global research to find alternatives to 3D semiconductor materials in the industry. At the same time there have been intensive advanced in the 2D magnetic materials. The superior properties of graphene are mainly attributed to both its crystal structure - 2D honeycomb lattice - and its short-range interactions. These properties show that the physics of natural and artificial 2D materials are promising candidates to start a new industrial paradigm. In this thesis we have investigated the eects of the 2D lattices structures, the range of the interaction as nearest neighbor (NN) and next nearest neighbor (NNN) interaction, and the forming of bilayer systems in the electronic and the magnetic excitations in several 2D materials represented by zigzag and armchair graphene nanoribbons as well as magnetic nanodots arrayed in stripes. The theoretical method employed throughout the thesis is based on the second quantization forms of both the tight-binding Hamiltonian for electronic excitations and the Heisenberg Hamiltonian for magnetic excitations. The results show that 2D lattices structures of these materials play a crucial rule in determining the shape of its dispersion relation. The case of the 2D square lattice shows an unexpected dispersion relation for the area and edge spin waves as they only have optic modes branches. In contrast, the case of the 2D honeycomb lattice shows very similar dispersion relation of magnetic nanodots stripes and their graphene counterpart. The study shows that introducing NNN with small strength interaction to the 2D materials removes the materials NN dispersion relations symmetry around the Fermi level and shifting the Fermi level, while increasing the NNN strength interaction compared to NN interaction change completely the 2D materials NN dispersion relations. The results also show that the 2D material sensitivity for NNN hopping eect is dependent on their lattice structure. The study also shows that forming the 2D materials as a bilayer system gives the possibility of tuning the system properties by changing many available parameters such that the interlayer hopping strength, introducing impurities, and changing the range of the interaction. Finally, the tridiagonal method has been used to distinguish between edges modes and area modes in order to study the edge sites properties eect on edge localized states of semiinfinite zigzag 2D honeycomb sheet. The results show a realistic behavior for the dependance of edge localized states of zigzag graphene on the edge sites properties which explains many experimental results. [ 来自科研家族 小木虫青春动力 ]    [ Last edited by lchpy on 2011-12-21 at 09:21 ] |
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2011-12-20 14:53:27, 3.16 M
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