This paper computes the conductance of an open ellipse cavity and discusses the effect of finite leads on conductance. The lead introduces mode coupling with bound states in the cavity which contributes to Fano resonant line shapes in conductance. By examining the resonant states in the cavity, the effects of state mixing and annular probability distribution of wave function due to the presence of leads are found. The results have been compared with the transport properties of other systems. The finite leads result in two effects, i.e. the evanescent mode contribution and additional oscillations, to the conductance.
Simulation of Auger electron image contrast formation is helpful for analyzing the images in scanning Auger microscopy/microanalysis(SAM),which provides elemental and chemical composition of surface and,thus,applies to the material evaluation and identification for many kinds of materials.……
The exchange bias of bilayer magnetic films consisting of ferromagnetic （FM） and antiferromagnetic （AFM） layers in an uncompensated case is studied by use of the many-body Green＇s function method of quantum statistical theory. The effects of the layer thickness and temperature and the interracial coupling strength on the exchange bias HE are investigated. The dependence of the exchange bias HE on the FM layer thickness and temperature is qualitatively in agreement with experimental results. When temperature varies, both the coercivity HC and HE decrease with the temperature increasing. For each FM thickness, there exists a least AFM thickness in which the exchange bias occurs, which is called pinning thickness.
