Spin-resolved transport properties of DNA base multi-functional electronic devices |
| |
Institution: | 1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;2. School of Mathematics, Physics and Energy Engineering, Hunan Institute of Technology, Hengyang 421002, China;3. Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China;4. College of Physics and Electronic Engineering, Nanning Normal University, Nanning 530001, China |
| |
Abstract: | By using density functional theory in combination with non-equilibrium Green's function method, we have investigated the spin-polarized electronic transport properties of four DNA base devices, namely, adenine (A), cytosine (C), guanine (G) and thymine (T). The results show the spin-polarized transport properties can be effectively regulated by adopting different bases, and thymine based device can exhibit high-efficiency spin-filtering, negative differential resistance, spin rectifying behaviors and switching effect by tuning the external magnetic field. We find that the variation in the degree of localization of the frontier molecular orbitals at different biases is responsible for these interesting phenomena. These effects can be explained by the spin-resolved transmission spectrum and the spatial distribution of molecular orbitals around the Fermi level. Our results suggest that thymine base holds great potential application in designing multi-functional spin molecular device. |
| |
Keywords: | DNA bases Spin electronic transport Density-function theory Non-equilibrium Green's function method |
本文献已被 ScienceDirect 等数据库收录! |
|