Valley Hall phases in kagome lattices
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Show full item recordcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/43662
comunitat-uji-handle3:10234/43643
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Title
Valley Hall phases in kagome latticesDate
2019Publisher
American Physical SocietyISSN
2469-9950; 2469-9969Bibliographic citation
LERA, Natalia, et al. Valley Hall phases in kagome lattices. Physical Review B, 2019, vol. 99, no 13, p. 134102.Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionAbstract
We report the finding of the analogous valley Hall effect in phononic systems arising from mirror symmetry
breaking, in addition to spatial inversion symmetry breaking. We study topological phases of plates and
sp ... [+]
We report the finding of the analogous valley Hall effect in phononic systems arising from mirror symmetry
breaking, in addition to spatial inversion symmetry breaking. We study topological phases of plates and
spring-mass models in kagome and modified kagome arrangements. By breaking the inversion symmetry it
is well known that a defined valley Chern number arises. We also show that effectively, breaking the mirror
symmetry leads to the same topological invariant. Based on the bulk-edge correspondence principle, protected
edge states appear at interfaces between two lattices with different valley Chern numbers. By means of a plane
wave expansion method and the multiple scattering theory for periodic and finite systems, respectively, we
computed the Berry curvature, the band inversion, mode shapes, and edge modes in plate systems. We also
find that appropriate multipoint excitations in finite system gives rise to propagating waves along a one-sided
path only [-]
Is part of
Physical Review B 99, 134102 (2019)Investigation project
FIS2015-64886-C5-5-P ; MDM-2014-0377 ; RYC-2016-21188 ; FIS2015-65706-P ; 714577 PHONOMETA ; RYC-2015-17156Rights
©2019 American Physical Society
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