Study On Physical Properties Of Two-dimensional Electronic System Under The Action Of Optical Field

This paper mainly studies the physical properties of two-dimensional graphene materials under elliptically polarized laser irradiation.The Floquet state was found to exhibit the photovoltaic anomalous hall effect when elliptically polarized light was applied to create gaps on line nodes in the body,leaving Weyl nodes.Besides,Hall conductivity is very sensitive to the position of Fermi energy level:when Fermi energy level is located at Weyl node,hall conductivity depends on the radius of the line node and is almost independent of the intensity of light;Hall conductivity depends on the intensity of the light when the Fermi level is away from the line node.Therefore,under weak laser irradiation,the sensitive dependence of hall conductivity on Fermi energy level can be used to solve the problem of electron transport in linear junction semi-metallic photoelectric materials.The influence of polarization Angle of ellipse on energy gap;The influence of polarization Angle of ellipse on conductivity.Under the framework of floquet theory,the transport of elliptically polarized light and semi-metal in elliptically polarized light is studied.Anomalous hall conductivity as a function of Fermi energy levels and temperature is calculated.We find that:(1)?F=0,this means that the Fermi level is at the line node,and the hall conductivity depends on the reduced radius,but it does not depend on the intensity of the light interaction.On the other hand,?F? 0,Hall conductivity,depends on the interaction between two simplified radius and the intensity of the light.Therefore,the magnitude of?zxAHE is sensitive to Fermi energy level when the incident ray intensity is weak.(2)With the change of o,The energy gap of the system changes periodically,and the period is ?/2,In particular,the elliptic polarized light returns to linearly polarized light and the energy gap is the smallest when ? is an integral multiple of ?/2 When ? is an odd number of ?/4,elliptically polarized light returns to circularly polarized light,and the gap is at its maximum.(3)When ?=?/4,the ellipse returns to the circle.When ?F=0,the Fermi energy level is at the Weyl point.When ?F=0.1,Fermi surface forms a torus;When ?F=0.2,the conventional spherical Fermi surface is realized.Hall conductance decreases as a monotonic function of T when ?F=0,However,hall conductance increases slightly at low temperatures when ?F=0.1 and ?F=0.2,When ?=?/3,the trend of the overall image is similar to ?=?/4,the difference is that,when ?F=0.1,the trend of decline becomes slower,and the conductivity decreases when ?F=0.1 and ?F=0.2 compared with the ?=?/4.