Valley Hall phases in kagome lattices
Scholar | Other documents of the author: Lera, Natalia; Torrent, Daniel; San-Jose, P.; Christensen, J.; Álvarez, J. V.
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TitleValley Hall phases in kagome lattices
PublisherAmerican Physical Society
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 [-]
Investigation projectFIS2015-64886-C5-5-P ; MDM-2014-0377 ; RYC-2016-21188 ; FIS2015-65706-P ; 714577 PHONOMETA ; RYC-2015-17156
Bibliographic citationLERA, Natalia, et al. Valley Hall phases in kagome lattices. Physical Review B, 2019, vol. 99, no 13, p. 134102.
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