Resonance Transmission in Graphene-Nanoribbon-Based Quantum Dot and Superlattice
XU Ning1,2, WANG Bao-Lin1, SUN Hou-Qian1, DING Jian-Wen2
1Department of Physics, Yancheng Institute of Technology, Yancheng 224051 2Department of Physics and Institute for Nanophysics and Rare-earth Luminescence, Xiangtan University, Xiangtan 411105
Resonance Transmission in Graphene-Nanoribbon-Based Quantum Dot and Superlattice
XU Ning1,2, WANG Bao-Lin1, SUN Hou-Qian1, DING Jian-Wen2
1Department of Physics, Yancheng Institute of Technology, Yancheng 224051 2Department of Physics and Institute for Nanophysics and Rare-earth Luminescence, Xiangtan University, Xiangtan 411105
摘要By using a decomposition elimination method for Green's function, the transport properties of Graphene-nanoribbon-based quantum dot (QD) and/or QD superlattice are studied. It is shown that relatively small changes of both QD size and magnetic field intensity can induce strong variations in the electron transmission across the structure. For a QD device, electrons can be either totally reflected or totally transmitted through the QD region at some energies, and the quasibound peaks have been observed to have a small shift due to quasibound state energy varying. In the case of QD superlattice, the electrons within the miniband energy region can transmit through a device, similar to a QD device. Therefore, the transmission spectrum can be tailored to match with requirement by modulating the size of quantum dot and the number p of superlattce.
Abstract：By using a decomposition elimination method for Green's function, the transport properties of Graphene-nanoribbon-based quantum dot (QD) and/or QD superlattice are studied. It is shown that relatively small changes of both QD size and magnetic field intensity can induce strong variations in the electron transmission across the structure. For a QD device, electrons can be either totally reflected or totally transmitted through the QD region at some energies, and the quasibound peaks have been observed to have a small shift due to quasibound state energy varying. In the case of QD superlattice, the electrons within the miniband energy region can transmit through a device, similar to a QD device. Therefore, the transmission spectrum can be tailored to match with requirement by modulating the size of quantum dot and the number p of superlattce.
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2010, Vol. 27 
