Transport Properties Of Two Dimensional Electron Gases In Antiparallel Magnetic-Electric Barrier Structures

In the early 1990s, the magnetic modulation with the scale of nanometer on the 2DEGs has been realized at laboratory according to the development and matures of the techniques such as electron beam lithography. Because of the fantastic electronic transport properties in this structure, it attracts much interest of physicists. In this paper, by developing a transfer method, we study theoretically transport properties of 2DEGs through antiparallel magnetic-electric barrier structures. Two kinds of magnetic barrier configurations are employed: one is that the strength of the doubleδ-function in opposite directions is equal and the other is that the strength is unequal. The results show that there exist the rules for ballistic tunneling and resonant splitting.The thesis consists of the summarization and other three chapters. In the summarization, it points out the evolution and importance of the research problem, and it also summarizes both theoric and experimental progress of this investigation. Chapter 2 is for the fundamental theories, which develops a transfer method and introduces concisely the Landauer-Buttiker theory. In chapter 3, we study mainly the tunneling and the resonant peak splitting of ballistic transport in 2DEGs through parallel magnetic-electric barrier structures. We investigate the transport properties of 2DEGs in antiparallel magnetic-electric barrier structures in chapter 4. It shows that, the course of ballistic transport under electromagnetic modulations is consistent with the one only through electric modulations or magnetic modulations in substance, besides the oscillations of transport improve rapidly for electromagnetic modulations.