Graphene-based interferometer to control topological valley currents. Electrons (red and green dots) travel the domain walls (yellow lines) in directions indicated by the purple arrows. The magnetic field points up (gray arrows).

From the article:

Manipulation and Characterization of the Valley-Polarized Topological Kink States in Graphene-Based Interferometers
Shu-guang Cheng, Haiwen Liu, Hua Jiang, Qing-Feng Sun, and X. C. Xie
Phys. Rev. Lett. 121, 156801 (2018)

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