Valley Hall phases in kagome lattices
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Otros documentos de la autoría: Lera, Natalia; Torrent, Daniel; San-Jose, Pablo; Christensen, J.; Álvarez, J. V.
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Valley Hall phases in kagome latticesFecha de publicación
2019Editor
American Physical SocietyISSN
2469-9950; 2469-9969Cita bibliográfica
LERA, Natalia, et al. Valley Hall phases in kagome lattices. Physical Review B, 2019, vol. 99, no 13, p. 134102.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.134102#fulltextVersión
info:eu-repo/semantics/publishedVersionResumen
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 [-]
Publicado en
Physical Review B 99, 134102 (2019)Proyecto de investigación
FIS2015-64886-C5-5-P ; MDM-2014-0377 ; RYC-2016-21188 ; FIS2015-65706-P ; 714577 PHONOMETA ; RYC-2015-17156Derechos de acceso
©2019 American Physical Society
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