Flat energy bands within antiphase and twin boundaries and at open edges in topological materials

Document Type

Article

Publication Date

1-29-2019

Abstract

A model for two-dimensional electronic, photonic, and mechanical metamaterial systems is presented, which has flat one-dimensional zero-mode energy bands and stable localized states of a topological origin confined within twin boundaries, antiphase boundaries, and at open edges. Topological origins of these flatbands are analyzed for an electronic system as a specific example, using a two-dimensional extension of the Su-Schrieffer-Heeger Hamiltonian with alternating shift of the chains. It is demonstrated that the slow group velocities of the localized flat band states are sensitively controlled by the distance between the boundaries and the propagation can be guided through designed paths of these boundaries. We also discuss how to realize this model in metamaterials.

Identifier

85060879947 (Scopus)

Publication Title

Physical Review B

External Full Text Location

https://doi.org/10.1103/PhysRevB.99.041117

e-ISSN

24699969

ISSN

24699950

Issue

4

Volume

99

Fund Ref

W. M. Keck Foundation

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