Dynamics of tilted superlattices with time-dependent impurity
- 作者：W.X. Yan ; B.-H. Xie ; Shuo Jin
- 关键词：Quasienergy ; Floquet replica ; Wannier– ; Stark ladders ; Density of state
- 刊名：Physics Letters A
- 出版年：2007
- 期刊代码：57_03759601
- 类别：ph
- 出版时间：17 September 2007
- 卷：369
- 期：3
- 页码：243-248
- 文件大小：1592 K
摘要
The influence of time-dependent impurity on the electronic and transport properties of the tilted superlattices modeled by the tight-binding Hamiltonian is investigated. The quasienergies of the system are calculated in two methods: exact diagonalization and Floquet replica technique, the subtle effects of the impurity on the dynamics of the system are discussed in detail. Through a perturbative analysis in terms of the inverse of the time-dependent impurity frequency, we obtain the time-independent effective Hamiltonian, whose reliability and physical implication are discussed.