Confined State and Electronic Transport in an Artificial Graphene-Based Tunnel Junction |
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Authors: | YUAN Jian-Hui ZHANG Jian-Jun ZENG Qi-Jun ZHANG Jun-Pei CHENG Ze |
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Institution: | School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract: | Artificial graphene structures embedded in semiconductors could open novel routes for studies of electron interactions in low-dimensional systems. We propose a way to manipulate the transport properties of massless Dirac fermions in an artificial graphene-based tunnel junction. Velocity-modulation control of electron wave propagation in the different regions can be regarded as velocity barriers. Transmission probability of electron is
affected profoundly by this velocity barrier. We find that there is no confinement for Dirac electron as the velocity ratioξ is less than 1, but when the velocity ratio is larger than 1 the confined state appears in the continuum band. These localized Dirac electrons may lead to the decreasing of transmission probability. |
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Keywords: | ballistic transport relativistic wave equations Carbon  diamond graphite |
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