Valley selection rule in a Y-shaped zigzag graphene nanoribbon junction |
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| Authors: | Zhang Lin, Wang Jun |
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| Abstract: | The valley valve effect was predicted in a straight zigzag graphene nanoribbon(ZGR) p/n junction. In this work, we address a possible valley selection rule in a Y-shaped ZGR junction. By modeling the system as a three-terminal device and calculating the conductance spectrum, we found that the valley valve effect could be preserved in the system and the Y-shaped connection does not mix the valley index or the pseudoparities of quasiparticles. It is also shown that the Y-shaped ZGR device can be used to separate spins in real space according to the unchanged valley valve effect. Our finding might pave a way to manipulate and detect spins in a multi-terminal graphene-based spin device. |
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| Keywords: | valley selection rule zigzag graphene nanoribbon pseudoparity conductance |
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