磁场调制下单层石墨烯势垒结构的隧穿特性  

Transport Properties in a Magnetic Field Modulated Graphene Structure

作　　者：史淑惠[1,2] 冯树波[1] 李玉现[1] 

机构地区：[1]河北师范大学物理科学与信息工程学院,河北石家庄050024 [2]邯郸学院物理与电气工程系,河北邯郸056005

出　　处：《河北师范大学学报（自然科学版）》2012年第3期257-262,共6页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金(10974043);河北省自然科学基金(A2009000240)

摘　　要：利用传递矩阵方法,在多方势垒基础上,采用渐近手段,研究了单层石墨烯不同势垒结构(方势垒和劈形势垒)的隧穿特性,结果发现势垒形状影响隧穿特性.对于2种形状的势垒结构,无论是透射系数还是平均电导率,既展现出相同的特点,又有明显不同之处.通过比较透射系数与平均电导率,得出各自的特点,为实际设计纳米器件提供理论基础.Transport properties in monolayer graphene-based square barrier and chop-shaped barrier structures are investigated by using the transfer matrix method and asymptotic technique.It is found that the structures of the barriers can significantly affect the transport properties.For the two kinds of structures either transmission probability or averaged conductivity,there are both similarities and great differences between them.The respective characteristics of the structures are revealed by making a comparison of transmission probability and averaged conductivity.These results are helpful in designing nano devices based on graphene.

关 键 词：石墨烯 方势垒 劈形势垒 隧穿特性 电导率 

分 类 号：O471.1[理学—半导体物理]