结构和磁场对三势垒结构中共振隧穿时间的影响(英文)  

The Effect of Structure and Magnetic Field on Resonant Tunneling Time in Triple-barrier Structures

作　　者：贾国治[1] 姚江宏[2] 何进密[2] 于沛[2] 

机构地区：[1]天津城市建设学院,天津300384 [2]弱光非线性光子学教育部重点实验室南开大学泰达应用物理学院,天津300475

出　　处：《发光学报》2010年第3期341-347,共7页Chinese Journal of Luminescence

基　　金：Supported by the Natural Science Foundation of Tianjin(09JCYBJC04100,08JCYBJC14800);Science and TechnologyPlan Projects of the Ministry of Construction of China(2008-K7-10);Chinese National Key Basic Research Special Fund(2010CB933801)~~

摘　　要：为了理解在三势垒结构中准束缚能级Ez和隧穿寿命对磁场的依赖性,采用传输矩阵的方法研究了在三势垒结构中的共振隧穿过程。分别研究了在三势垒结构中的透射几率特征和隧穿寿命。结果表明:随着中间势垒厚度L的增加,第一准束缚能级E1z增加,而第二准束缚能级E2z却减小。随着磁场强度B和朗道量子数n的增加,与第一和第二准束缚能级(E1z,E2z)对应的寿命τ缩短。对于B=15和n=15的情况,L对τ的影响很小。To understand the dependence of the quasi-bound level energies Ez and the tunneling lifetime on the magnetic fields B,resonant tunneling in the triple-barrier structure was investigated by using the transfer matrix method.Transmission probability characteristics and the tunneling lifetime in the triple-barrier structure are investigated,respectively.The results showed that the first quasi-bound energy levels E1z increase,while the second quasi-bound energy levels E2z decrease with the increasing of the middle barrier thickness L.The lifetime τ of E1z and E2z is shortened with increasing of B and Landau quantum number n,and the effect of L on τ is weak for B = 15 and n = 15.

关 键 词：共振隧穿 三势垒结构 传输矩阵理论 

分 类 号：O471.1[理学—半导体物理]