Schematic of the Device Used to Control Valley Current (IMAGE)

University of Tokyo

Schematic of the Device Used to Control Valley Current

Caption

A vertical electric field (green arrows) breaks the symmetry of the bilayer graphene allowing for selective control of valley. A conventional, small electrical current (purple arrow) is converted into valley current via the valley Hall effect (VHE). (The electrons in the K valley, blue, travel to the right; while the electrons in the K� valley, pink, travel to the left.) Pure valley current travels over a significant distance. At the other side of the device the valley current is converted back to charge current via the inverse valley Hall effect (IVHE) and is detected as a voltage.

Credit

2015 Seigo Tarucha

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