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Topological chiral interface states beyond insulators
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classification
cond-mat.mes-hallcond-mat.other
keywords
bandstopologicalbulkchiralflowinterfacespectralstates
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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.
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