| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Novel Transport Properties in Monolayer Graphene with Velocity Modulation |
| SUN Li-Feng1, FANG Chao1**, LIANG Tong-Xiang2 |
1Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084
2Beijing Key Laboratory of Fine Ceramics, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084
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| Cite this article: |
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SUN Li-Feng, FANG Chao, LIANG Tong-Xiang 2013 Chin. Phys. Lett. 30 047201 |
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Abstract We investigate the transport properties of Dirac fermions through velocity-modulation structures, with the Fermi velocity inside the barriers larger than the one outside. It is shown that the transmission exhibits pseudo-periodicity with the incident angle below the critical transmission angle, but attenuates exponentially in the opposite situation. It is found that in the transmission, (1) the pseudo-periodicity turns to periodicity with suitable modulation; (2) line-type peaks appear in the exponential attenuation region for multiple velocity barriers; (3) peak splitting occurs with the number of the velocity barriers increasing. Some sharp oscillations with the falling-edge slopes close to infinity exist in the conductance profile. These novel transport properties suggest significant potential applications in graphene-based devices.
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Received: 24 January 2013
Published: 28 April 2013
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