Density plot of conductance in a higher-order topological insulator against the strength (vertical axis) and angle (horizontal axis) of the magnetic field.

From the article:

Higher-Order Fabry-Pérot Interferometer from Topological Hinge States
Chang-An Li, Song-Bo Zhang, Jian Li, and Björn Trauzettel
Phys. Rev. Lett. 127, 026803 (2021)

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