Effect Of Magnetic Field On The Electron Transport Of Single-graphene Barrier Structure

In this paper,using the transfer matrix method,we have studied the tunneling properties of the magnetic field for the single layer grapheme ? barrier structure.When studying on the electron tunneling characteristics of the superlattice ? barrier,we take the square barrier model as the basic of this research.Then making the barrier width tend to 0,the barrier height tend to infinity,the product of height and width be a constant P(called the barrier strength),so the square barrier model can transition to ? barrier model.Finally,we can get the calculation of electronic tunneling in the ? barrier model structure.In the study,we found that the magnetic field strength and the number of potential barriers in this system have an obvious effect on the tunneling characteristics.The more the number of superlattice ? barrier is,the smaller the average conductance of grapheme is.After adding magnetic field,the incident electron will change its trajectory due to the effect of Lorents force,which also affects the transmission probability.Because of the quantum effect,some transmission coefficients corresponding to the range of the incidence angle will appear peak value.Afterwards,Klein tunneling region changes,and at a certain angle of incidence the electron is prevented from tunneling,which are caused by the influence of the magnetic field barrier and the electrostatic barrier on the electron tunneling.And because there is an oscillation in the average conductivity,the intensity of the oscillation is also influenced by the strength of the magnetic field and the number of the potential barriers.The stronger the magnetic field is,the smaller the conductivity is.In addition,the amplitude and period of the oscillation are closely related to the magnetic field's strength.Along with the number of potential barrier increasing,the oscillation of the conductance will be enhanced.When the Fermi energy is less than a certain energy value,the average conductance is "0",and the electron tunneling is completely inhibited.