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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。
In order to understand the dependence of the quasi-binding energy level Ez and the tunneling lifetime on the magnetic field in the three-barrier structure, the resonant tunneling process in the three-barrier structure is studied by the transfer matrix method. The transmission probability characteristics and tunneling lifetime in the three-barrier structure are studied respectively. The results show that with the increase of the intermediate barrier thickness L, the first quasi-binding energy level E1z increases and the second quasi-binding energy level E2z decreases. As the magnetic field strength B and Landau quantum number n increase, the lifetime τ corresponding to the first and second quasi-bounded energy levels (E1z, E2z) is shortened. For B = 15 and n = 15, L has little effect on τ.