Topological chiral interface states beyond insulators
arXiv:2002.09374 · doi:10.1103/PhysRevA.102.023520
Abstract
We show how to engineer a chiral spectral flow of interface states in a gapless system. Although the bulk bands touch -- thus making the topological indices of the bands ill-defined -- this spectral flow has a topological origin that makes it robust even when it coexists with the bulk bands. This phenomenon is illustrated with an adiabatically modulated photonic quantum walk.
arXiv comment8 pages,9 figs
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