结构和磁场对三势垒结构中共振隧穿时间的影响(英文)

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。

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

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 Eu increase, while the second quasi-bound energy levels E1z decrease with the increasing of the middle barrier thickness L. The lifetime T of E1z and E2z is shortened with increasing of B and Landau quantum number n, and the effect of L on T is weak for B = 15 and n = 15.