|Alternative Title||Transition Metal Atoms Localized Magnetic Moments in Metal-Graphene Hybrided System
|Place of Conferral||兰州
|Other Abstract||Anderson model is an important model to deal with magnetic impurity, and under the Hartree-Fock Approximation ,this model can be used to study the localized magnetic moments on metal (semi-conductor, graphene and so on).
In this thesis we review the work on the Anderson impurity model, which the transition metal
atom is doped into the metal and adsorbed on the surface of graphene. The research indicated that the boundary between magnetic and non-magnetic regions of two systems is so different. In the metal case it is symmetric, while in the graphene case it is strongly asymmetric.
In order to study the localized magnetic moments in grapheme with a magnetic impurity atom and a metal probe, then we use the metal-graphene hybrided system’s Anderson model, and numerically calculate some variables and the region that exit localized magnetic moments. We find that the boundary between magnetic and non-magnetic region mainly depends on the metal probe and magnetic coupling strength of impurity. With the increasing of the coupling strength of impurity, magnetic impurity boundary between magnetic and non-magnetic gradually transfers from graphene situation to the metal case, or transfer from the metal situation to the graphene case. It is also found that the states are unstable as the coupling strengths between the metal and the impurity and between the graphene and the impurity are in the same order, which need further theoretical study.|
张欄. 金属-石墨烯混合系统中过渡族金属原子局域磁矩研究[D]. 兰州. 兰州大学,2014.
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