摘要
                
                    采用群速度的方法来研究磁势垒结构中的隧穿时间,同时考虑了电子自旋以及外加电场的效应.研究发现,磁势垒结构中的隧穿时间很大程度上依赖于势垒结构、偏压、电子入射能量和它的自旋方向,以及纵向波矢.结果显示,对于具有相同能量但入射角度或自旋不同的电子,即使穿透相同的磁势垒结构,隧穿过程也在时间上大不相同,隧穿时间会随着自旋、纵向波矢和偏压的改变有较大的变化.
                
                Adopted the group velocity approach to the issue of tunneling time in magnetic barrier structures, and consider the effects of the electrom spin and the applied bias. It is shown that the tunneling time in magetic barrier structures is strongly depended on the magnetic configuration, the applied bias, the incident energy and the electron spin as well as the longitudinal wave vector. The results indicated that for electrons with equal energy but different incident angles or the electron spin, the tunneling processes are significantly separated in time within the same magnetic barrier structure. It is also found that the tunneling time varies distinctly with the electrom spin, the longitudinal wave vector and the applie bias.
    
    
    
    
                出处
                
                    《湖南师范大学自然科学学报》
                        
                                EI
                                CAS
                                北大核心
                        
                    
                        2005年第3期36-39,共4页
                    
                
                    Journal of Natural Science of Hunan Normal University
     
            
                基金
                    湖南省自然科学基金资助项目(03JJ3012)
                    湖南科技学院青年重点课题基金(05QZD005)
                    教学课题基金资助项目(05JGKT001)
            
    
                关键词
                    二维电子气
                    群速度
                    磁势垒结构
                    隧穿时间
                
                        two-dimensionl electron gas
                         group velocity
                         magnetic barrier structure
                         tunneling time
                
     
    
    
                作者简介
刘辉(1964-),女,湖南汉寿人,湖南师范大学副教授。