Acoustic phonon confinement by band inversion

M. Esmann, F. R. Lamberti, O. Ortiz, N. D. Lanzillotti-Kimura

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Resumen

We study the formation of a topological interface mode between two nanometric acoustic superlattices presenting inverted band structures. That is, the two lattices share a common band gap but present opposite spatial mode symmetries of the two Bloch modes bounding the gap from below and above. We first show that by tuning the acoustic-thickness ratio between the two materials in a unit cell of a GaAs/AlAs superlattice a band structure inversion can be induced at the Brillouin zone center. Secondly, we show that two concatenated superlattices with inverted band structures form a topological interface mode with its strain spatially confined.

Idioma originalInglés
Páginas (desde-hasta)126-129
Número de páginas4
PublicaciónMaterials Today: Proceedings
Volumen14
DOI
EstadoPublicada - 2019
Publicado de forma externa
Evento23rd Latin American Symposium on Solid State Physics, SLAFES 2018 - San Carlos de Bariloche, Argentina
Duración: 10 abr. 201813 abr. 2018

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