Zhu, MJ , Inst Appl Phys & Computat Math, POB 8009, Beijing 100080, Peoples R China.
部门归属:
Inst Appl Phys & Computat Math, Beijing 100080, Peoples R China; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; Univ Texas, Dept Phys, Austin, TX 78712 USA
英文摘要:
We study the propagation of an electron in a superlattice under the action of a rectangular-wave electric field. Exact results for any initial distribution and long-range hopping couplings are obtained. Total collapse of the quasi-energy spectrum is found to take place at suitably chosen field parameters, which leads to the transition between localization and delocalization. Moreover, this localization/delocalization behaviour persists even if long-range hoppings are taken into account. The transport property of the system is also investigated where the signatures of the transition between localization and delocalization as well as fractional Wannier-Stark ladders are manifested.
Zhu, MJ,Zhao, XG,Niu, Q. Manipulation of band electrons with a rectangular-wave electric field[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,1999,11(23):4527-4538.
