The Research On Optics-like Phenomena Of Electron Transmission In Graphene Quantum Structure

Graphene has been a hotspot for its particular property since it has been found in 2004. Based on the interesting property, e.g. Klein tunneling, etc, the research in transmission, conductance in monolayer graphene structure, like single barrier, double barriers and superlattice, has been researched comprehensively. In addition, electron transport properties in graphene and the similar optical properties, further study of these graphene analogies to the electron optical properties of the class and its modulation.This dissertation will be discussed from electron transport properties of the basic structure in graphene, then to elaborate optical-like phenomena in graphene, such as GH shift, the modulation on superlattice. These GHL shifts, which can also be modulated by the height of potential barrier and the induced gap, have potential applications in various graphene-based electronic devices. We further hope that these similar phenomena in graphene nanostructure with magnetic-electric barrier and spin-orbit coupling may lead to the graphene based spintronic devices.The main contents include the following aspects:1. Introduce the history from the first time that graphene has been found, and the current situation in the field domestic and overseas. Moreover, introduce the progress in particular electric transmission properties and optical-like research.2. Explain the electric transmission property in singer barrier in monolayer graphene and its modulation. It has been investigated that the transmission in monolayer graphene barrier at nonzero angle of incidence. Taking the influence of parallel wave vector into account, the transmission as the function of incidence energy has a gap due to the evanescent waves in two cases of Klein tunneling and classical motion.3. It has been investigated that the lateral shifts of Dirac fermions in transmission through a monolayer graphene barrier. Compared to the smallness of the lateral shifts in total reflection, the lateral shifts can be enhanced by the transmission resonances when the incidence angle is less than the critical angle for total reflection. It is also found that the lateral shifts, as the function of the barrier's width and incidence angle, can be negative and positive in the cases of Klein tunneling and classical motion.4. Discuss the electronic transports in the asymmetric graphene superlattice consisted of a periodic potential structure and wide potential barrier, which are separated by an internal potential well. The results show that under a certain condition a novel transmission peak occurs in the original gap region at non-zero incident angles, and reveal that such asymmetric graphene superlattice containing a potential well can be equivalent to a double-barrier structure and two-coupled superlattices. Moreover, it has also shown that the controllable magnitude and width of the quantum well have a great effect on the electronic transmission and conductivity.