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복잡계 이론물리 연구단
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Anti- PT flatbands

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Title
Anti- PT flatbands
Author(s)
Arindam Mallick; Nana Chang; Alexei Andreanov; Sergej Flach
Publication Date
2022-02
Journal
Physical Review A, v.105, no.2
Publisher
American Physical Society
Abstract
© 2022 American Physical Society.We consider tight-binding single-particle lattice Hamiltonians which are invariant under an antiunitary antisymmetry: the anti-PT symmetry. The Hermitian Hamiltonians are defined on d-dimensional non-Bravais lattices. For an odd number of sublattices, the anti-PT symmetry protects a flatband at energy E=0. We derive the anti-PT constraints on the Hamiltonian and use them to generate examples of generalized kagome networks in two and three lattice dimensions. Furthermore, we show that the anti-PT symmetry persists in the presence of uniform DC fields and ensures the presence of flatbands in the corresponding irreducible Wannier-Stark band structure. We provide examples of the Wannier-Stark band structure of generalized kagome networks in the presence of DC fields, and their implementation using Floquet engineering.
URI
https://pr.ibs.re.kr/handle/8788114/11362
DOI
10.1103/PhysRevA.105.L021305
ISSN
2469-9926
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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