Valley polarization due to trigonal warping on tunneling electrons in graphene

The effect of trigonal warping on the transmission of electrons tunneling through potential barriers in graphene is investigated. We present calculations of the transmission coefficient for single and double barriers as a function of energy, incidence angle and barrier heights. The results show rema...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2009-01, Vol.21 (4), p.045301-045301 (4)
Main Authors: Pereira Jr, J M, Peeters, F M, Costa Filho, R N, Farias, G A
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in multilayers, nanoscale materials and structures
Exact sciences and technology
Physics
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Summary:The effect of trigonal warping on the transmission of electrons tunneling through potential barriers in graphene is investigated. We present calculations of the transmission coefficient for single and double barriers as a function of energy, incidence angle and barrier heights. The results show remarkable valley-dependent directional effects for barriers oriented parallel to the armchair or parallel to the zigzag direction. These results indicate that electrostatic gates can be used as valley filters in graphene-based devices.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/21/4/045301