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

Linghua Zhu, Emil Prodan, Keun Hyuk Ahn

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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.

Original languageEnglish (US)
Article number041117
JournalPhysical Review B
Volume99
Issue number4
DOIs
StatePublished - Jan 29 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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