TY - JOUR
T1 - Flat energy bands within antiphase and twin boundaries and at open edges in topological materials
AU - Zhu, Linghua
AU - Prodan, Emil
AU - Ahn, Keun Hyuk
N1 - Funding Information:
We thank Tsezar F. Seman for the help with figures, and thank members of Academic and Research Computing Systems in the NJIT Information Services and Technology Division for their assistance. The simulations primarily used computational resources managed by NJIT Academic and Research Computing Systems. E.P. acknowledges support from the W. M. Keck Foundation.
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/1/29
Y1 - 2019/1/29
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.99.041117
DO - 10.1103/PhysRevB.99.041117
M3 - Article
AN - SCOPUS:85060879947
SN - 0163-1829
VL - 99
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 4
M1 - 041117
ER -