【摘 要】
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The spin-dependent electronic transport properties of a zigzag zinc oxide (ZnO) nanoribbon are studied by using density functional theory with non-equilibrium G
【机 构】
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School of Information Science Technology, Northwest University, Xi’an 710127, China;School of Physic
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The spin-dependent electronic transport properties of a zigzag zinc oxide (ZnO) nanoribbon are studied by using density functional theory with non-equilibrium Green’s functions.We calculate the spin-polarized band structure,projected density of states,Bloch states,and transmission spectrum of the ZnO nanoribbon.It is determined that all Bloch states are located at the edge of the ZnO nanoribbon.The spin-up transmission eigenchannels are contributed from Zn 4s orbital,whereas the spin-down transmission eigenchannels are contributed from Zn 4s and O 2p orbitals.By analyzing the currentvoltage curves for the opposite spins of the ZnO nanoribbon device,negative differential resistance (NDR) and spin filter effect are observed.Moreover,by constructing the ZnO nanoribbon modified by the Zn-edge defect,the spin-up current is severely suppressed because of the destruction of the spin-up transmission eigenchannels.However,the spin-down current is preserved,thus resulting in the perfect spin filter effect.Our results indicate that the ZnO nanoribbon modulated by the edge defect is a practical design for a spin filter.
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