Higher-Order Fabry-Pérot Interferometer from Topological Hinge States.

  title={Higher-Order Fabry-P{\'e}rot Interferometer from Topological Hinge States.},
  author={Chang-An Li and Song-Bo Zhang and Jian Li and Bjorn Trauzettel},
  journal={Physical review letters},
  volume={127 2},
We propose an intrinsic three-dimensional Fabry-Pérot type interferometer, coined "higher-order interferometer," that is based on the chiral hinge states of second-order topological insulators and cannot be mapped to an equivalent two-dimensional setting because of higher-order topological obstructions. Quantum interference patterns in the two-terminal conductance of this interferometer are controllable not only by tuning the strength but also, particularly, by rotating the direction of the… 

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