We report a theoretical study on the valley-filter and valley-valve effects in the monolayer graphene system by using electrostatic potentials, which are assumed to be electrically controllable. Based on a latt
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In a bent graphene strip, the valley-polarized current can be directed towards one edge providing a theoretical possibility to observe a zero-magnetic-field analogue of the well-known Hall effect. For the valley valve, built of two valley filters in series and controlled elecrostatically by a ...
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W. J. Beenakker, "Valley filter and valley valve in graphene," Nature Physics 3, 172-175 (2007).Rycerz A,Tworzydlo J,Beenakker C W J.Valley filter and valley valve in graphene. Nat. Phys . 2007Rycerz A,Tworzydlo J,Beenakker C W J.Valley filter and valley valve in graphene...
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2. Due to their large separation in momentum space, these constitute a novel discrete orbital degree of freedom for low-energy carriers, which could be used to store, filter and transport information3much in the same way the electronic spin is used for spintronics applications. When spatial ...
Sign reversal of Berry curvature across two oppositely gated regions in bilayer graphene can give rise to counter-propagating 1D channels with opposite valley indices. Considering spin and sub-lattice degeneracy, there are four quantized conduction chann