Transport Properties Of Low-dimensional Materials Based On Scattering Matrix

In this paper,the scattering matrix method is used to analyze the transport properties of two-dimensional semiconductor materials,exploring the electron transport properties and application scenarios of graphene,silene,and black phosphorus.We mastered the basic methods of quantum control by analyzed the transport properties of black phosphorene heterojunctions.In the first chapter,we describe the structure,preparation methods,and research status of several leading-edge two-dimensional semiconductor materials:graphene,silene,and black phosphorus materials.Understanding that these materials have unique quantum transport properties which can prompte us to conduct research on the properties of electron transport.In the second chapter,in order to better explore the transport properties of two-dimensional materials,we compared the scenarios and advantages and disadvantages of classical transport and mesoscopic physical transport methods,and identified the most appropriate research scheme for quantum transport,and introduced the calculation principles of scattering matrix method and density functional theory in detail.In the third chapter,we build a graphene heterojunction model and analyze the transmission of the heterojunction under the applied magnetic field and the electric field.It is found that the transmission of vertically incident electrons reaches the maximum values without magnetic filed,which associates with Klein tunneling.Then we studied the transport properties of the silicene nanofilm under the action of the mechanical stress and the external electric field,and found that the combination of the mechanical stress and the external electric field can not only effectively modulate the valley-dependent transport behaviors of the silicene heterojunctions,but also can modulate the spin-dependent transport properties,and achieving spin and valley polarizations.In the fourth chapter,we conducted an depth discussion on the transport properties of black phosphorus.We constructed the black phosphorus model and used the scattering matrix method to construct the corresponding schrodinger equation,then we calculated the transmission coefficient of black phosphorus according to the analytical equation,and used the matalb software to draw the curves of the transmission coefficient under the different wave vectors of black phosphorus,voltage,ferromagnetic materials and anisotropic parameters.In terms of the numerical calculations,we obtained the varing relationship between the transmission and the system's parameters of the black phosphorus.Not only that,we can also use the scattering matrix method to adjust the transmittance of black phosphorus through different proportions of the factors affecting the black phosphorus,thereby improving the performance of the corresponding device.In the fifth chapter,we summarize the research content of the giant magnetoresistance effect of graphene heterojunctions,the transport of silene nanoribbons,and the transport of black phosphorus,Finally,we analyzed and elaborated the follow-up research of two-dimensional materials.