359 citations · 862 across the 14 of their papers we have counts for
4 papers · 1 filter
Anomalous topological edge states in non-Hermitian piezophononic media
Penglin Gao, Morten Willatzen, Johan Christensen
The bulk-boundary or bulk-edge correspondence is a principle relating surface confined states to the topological classification of the bulk. By combining non-Hermitian ingredients…
Corner states in second-order mechanical topological insulator
Chun-Wei Chen, Rajesh Chaunsali, Johan Christensen +2
We numerically and experimentally study corner states in a continuous elastic plate with em-bedded bolts in a hexagonal pattern. While preserving C6 crystalline symmetry, the syste…
Flat bands in magic-angle vibrating plates
María Rosendo, Fernando Peñaranda, Johan Christensen +1
Twisted bilayer graphene develop quasi-flat bands at specific "magic" interlayer rotation angles through an unconventional mechanism connected to carrier chirality. Quasi-flat band…
Topological sound pumping of zero-dimensional bound states
Penglin Gao, Johan Christensen
Topological phases have spurred unprecedented abilities for sound, light and matter engineering and recent progress has shown how waves not only confine at the interfaces between t…