Topological chiral phonons in center-stacked bilayer triangle lattices

Since chiral phonons were found in an asymmetric two-dimensional hexagonal lattice, there has been growing interest in the study of phonon chirality, which were experimentally verified very recently in monolayer tungsten diselenide (2018 Science 359 579). In this work, we find chiral phonons with no...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2018-06, Vol.30 (22), p.225401-225401
Main Authors: Xu, Xifang, Zhang, Wei, Wang, Jiaojiao, Zhang, Lifa
Format: Article
Language:English
Subjects:
bilayer triangle lattices
chiral phonons
phonon Berry curvature
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Summary:Since chiral phonons were found in an asymmetric two-dimensional hexagonal lattice, there has been growing interest in the study of phonon chirality, which were experimentally verified very recently in monolayer tungsten diselenide (2018 Science 359 579). In this work, we find chiral phonons with nontrivial topology in center-stacked bilayer triangle lattices. At the Brillouin-zone corners, (), circularly polarized phonons and nonzero phonon Berry curvature are observed. Moreover, we find that the phonon chirality remain robust with changing sublattice mass ratio and interlayer coupling. The chiral phonons at the valleys are demonstrated in doubler-layer sodium chloride along the [1 1 1] direction. We believe that the findings on topological chiral phonons in triangle lattices will give guidance in the study of chiral phonons in real materials and promote the phononic applications.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/aabf5e