Proposed Valley Valve from Four-Channel Valley Manipulation

Abstract

Suggesting the AB-stacked bilayer WS2/MoS2 heterostructure as an ideal architecture for Berry curvature engineering, we theoretically demonstrate that it is possible to manipulate valley polarizations at K and -K valleys on each layer in a distinguishable fashion and then attempt an operation using four channels of valley manipulations, that is, four pairwise incorporations of KWS2 and (-K)WS2, KMoS2 and (-K)MoS2,KWS2 and KMoS2, and (-K)WS2 and (-K)MoS2, within a frame of the electro-optic method. Four-channel valley manipulation, which provokes varied anomalous Lorentz effects, conveys a development of multimode inverse valley Hall currents comprising two intralayer and one interlayer modes, each of which has a different nonlocal resistance. This finding proposes an alternative discipline of valley valve of valleytronics to manage a variable (multilevel) nonlocal resistance to the valley-mediated nonlocal charge current, in analogy with the spin valve of spintronics. © 2019 American Physical Society.