Аннотация
Propagation of an electron wave packet through a quantum point contact
(QPC) defined by electrostatic gates in bilayer graphene is
investigated. The gates provide a bias between the layers, in order to
produce an energy gap. If the gates on both sides of the contact produce
the same bias, steps in the electron transmission probability are
observed, as in the usual QPC. However, if the bias is inverted on one
of the sides of the QPC, only electrons belonging to one of the Dirac
valleys are allowed to pass, which provides a very efficient valley
filtering.
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