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Paper detail

Perfect valley filter controlled by Fermi velocity modulation in graphene

In this work we investigate the effects of a Fermi velocity modulation in a valley filter in graphene created by a combination of a magnetic and electric barrier. With the effective Dirac equation of the system, we use the transfer matrix formalism to obtain the transmittance. We verify that the valley transport in graphene is very sensitive to a Fermi velocity modulation, which is able to choose which valley will be filtered with perfect filtering. Also, it is possible to use a Fermi velocity modulation to filter both valleys or to make the valley filter transparent. It reveals that the Fermi velocity is a powerful tool that can be used to tune a graphene valley filter, since it has a total control in its transport properties.

preprint2020arXivOpen access
A. R. S. LinsJonas R. F. Lima
cond-mat.mes-hall
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A. R. S. LinsJonas R. F. Lima

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