# Observation of phononic helical edge states in a mechanical topological insulator

@article{Ssstrunk2015ObservationOP, title={Observation of phononic helical edge states in a mechanical topological insulator}, author={Roman S{\"u}sstrunk and Sebastian D. Huber}, journal={Science}, year={2015}, volume={349}, pages={47-50} }

A topological insulator, as originally proposed for electrons governed by quantum mechanics, is characterized by a dichotomy between the interior and the edge of a finite system: The bulk has an energy gap, and the edges sustain excitations traversing this gap. However, it has remained an open question whether the same physics can be observed for systems obeying Newton’s equations of motion. We conducted experiments to characterize the collective behavior of mechanical oscillators exhibiting… CONTINUE READING

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