摘要
We study the electronic properties for the graphene-based one-dimensional superlattices, whose potential voltages vary according to the envelope of a Gaussian function. It is found that an unusual Dirac point exists and its location is exactly associated with a zero-averaged wave number （zero-re） gap. This zero-k gap is less sensitive to incident angle and lattice constants, properties opposing those of Bragg gap. The defect mode appearing inside the zero-l gap has an effect on transmission, conductance, and shot noise, which will be useful for further investigation.
We study the electronic properties for the graphene-based one-dimensional superlattices, whose potential voltages vary according to the envelope of a Gaussian function. It is found that an unusual Dirac point exists and its location is exactly associated with a zero-averaged wave number （zero-re） gap. This zero-k gap is less sensitive to incident angle and lattice constants, properties opposing those of Bragg gap. The defect mode appearing inside the zero-l gap has an effect on transmission, conductance, and shot noise, which will be useful for further investigation.
基金
Project supported by the National Natural Science Foundation of China (Grant No.61001018)
the Natural Science Foundation of Shandong Province,China (Grant Nos.ZR2011FM009 and ZR2012FM011)
the Research Fund of Shandong University of Science and Technology,China (Grant Nos.2010KYJQ103 and 2012KYTD103)
the Project of Shandong Province Higher Educational Science and Technology Program,China (Grant No.J11LG20)
the Qingdao Municipal Science & Technology Project,China (Grant No.11-2-4-4-(8)-jch)
the Qingdao Municipal Economic and Technical Development Zone Science and Technology Project,China (Grant No.2013-1-64)
the Shandong University of Science and Technology Foundation,China (Grant No.YC130220)
