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Ajith Ramachandran
복잡계 이론물리 연구단
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Chiral flat bands: Existence, engineering, and stability

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Title
Chiral flat bands: Existence, engineering, and stability
Author(s)
Ajith Ramachandran; Alexei Andreanov; Sergej Flach
Publication Date
2017-10
Journal
PHYSICAL REVIEW B, v.96, no.16, pp.161104 -
Publisher
AMER PHYSICAL SOC
Abstract
We study flat bands in bipartite tight-binding networks with discrete translational invariance. Chiral flat bands with chiral symmetry eigenenergy E = 0 and host compact localized eigenstates for finite range hopping. For a bipartite network with a majority sublattice chiral flat bands emerge. We present a simple generating principle of chiral flat-band networks and as a showcase add to the previously observed cases a number of new potentially realizable chiral flat bands in various lattice dimensions. Chiral symmetry respecting network perturbations—including disorder and synthetic magnetic fields—preserve both the flat band and the modified compact localized states. Chiral flat bands are spectrally protected by gaps and pseudogaps in the presence of disorder due to Griffiths effects. ©2017 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/3896
DOI
10.1103/PhysRevB.96.161104
ISSN
2469-9950
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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