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Observación de anomalías de dispersión por diseño

Mahmoud M Samak¹, Osama R Bilal¹

¹School of Mechanical, Aerospace, and Manufacturing Engineering, University of Connecticut, Storrs, CT, 06269, USA.

Advanced materials (Deerfield Beach, Fla.)

|January 10, 2026

Resumen

Los acoplamientos magnéticos pueden crear anomalías de fonones de frecuencia cero, permitiendo bandas prohibidas completas de número de onda sin modulación temporal o acoplamiento fonón-electrón. Este descubrimiento abre nuevas vías para el diseño de materiales y los estudios de interacción onda-materia.

Área de la Ciencia:

Física de la materia condensada; Ciencia de materiales; Acústica

Sus antecedentes:

Las estructuras de banda son cruciales para comprender las propiedades de los materiales como el comportamiento electrónico, óptico y acústico.
Las anomalías de dispersión en las relaciones frecuencia-número de onda se han relacionado con el acoplamiento fonón-electrón o las interacciones de largo alcance.

Objetivo del estudio:

Investigar cómo los acoplamientos magnéticos pueden inducir rigidez negativa y modificar las relaciones de dispersión.
Demostrar la creación de anomalías de fonones de frecuencia cero en números de onda distintos de cero.
Lograr bandas prohibidas completas de número de onda sin depender de la modulación temporal, el acoplamiento fonón-electrón o las interacciones de largo alcance.

Principales métodos:

Combinación de enfoques experimentales, numéricos y analíticos.
Investigación de acoplamientos magnéticos para esculpir relaciones de dispersión.
Identificación de condiciones para fonones de frecuencia cero no diferenciables.

Principales resultados:

Se demostró que los acoplamientos magnéticos inducen rigidez negativa, lo que respalda las anomalías de fonones de frecuencia cero.
Se realizaron bandas prohibidas completas de número de onda sin modulación temporal, acoplamiento fonón-electrón o interacciones de largo alcance.
El marco se generalizó en varios tipos de redes, metamateriales y cristales de mayor dimensión.
Se informó la primera observación experimental de bandas prohibidas de número de onda en dimensiones superiores.

Conclusiones:

Los acoplamientos magnéticos ofrecen un nuevo mecanismo para la ingeniería de dispersión.
Este trabajo establece un nuevo paradigma para controlar las interacciones onda-materia tanto en los dominios de frecuencia como de número de onda.
Los hallazgos proporcionan información sobre la propagación de ondas y las propiedades de los materiales a través de la manipulación de las estructuras de banda.

Palabras clave:

metamaterial acústico ingeniería de dispersión medios no locales anomalías de dispersión de fonones ondas sonoras

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