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Efecto de piel topológico Z2 unidimensional impulsado por acoplamientos acústicos con pérdidas

Shuochen Wang¹, Wei Xiong¹, Zhiwang Zhang¹

¹Nanjing University, Department of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, Nanjing 210093, China.

Physical review letters

|January 30, 2026

Resumen

Los investigadores demostraron un novedoso efecto de piel no hermitiano Z2 (NHSE) en un sistema acústico pasivo. Este trabajo pionero muestra la localización de sonido polarizada por espín en un cristal sónico bicapa, allanando el camino para el control avanzado de ondas.

Área de la Ciencia:

Física de la materia condensada
Acústica
Metamateriales

Sus antecedentes:

El efecto de piel no hermitiano (NHSE) es un fenómeno por el cual los estados del volumen se localizan en los límites.
El marco no de Bloch y la zona de Brillouin generalizada caracterizan el NHSE en sistemas 1D.
El NHSE se clasifica en tipos Z y Z2 según las propiedades funcionales de la corriente.

Objetivo del estudio:

Demostrar experimentalmente un efecto de piel no hermitiano Z2 (NHSE) 1D en un sistema acústico pasivo.
Establecer una plataforma para observar la localización de piel polarizada por espín.
Explorar el control de ondas de espín-móvil en metamateriales topológicos no hermitianos.

Principales métodos:

Se utilizó un cristal sónico bicapa con acoplamientos con pérdidas adaptados.
Se introdujo un campo de calibre artificial a través de acoplamientos intercapa escalonados.
Se implementó disipación sintonizable utilizando esponjas absorbentes de sonido.

Principales resultados:

Se demostró con éxito el 1D Z2 NHSE en un sistema acústico pasivo.
Se observó localización de piel polarizada por espín con estados de espín-arriba y espín-abajo acumulándose en extremos opuestos.
Se confirmó el efecto a través de la dispersión de bandas, mapeo de campo espacial y espectroscopía de transmisión.

Conclusiones:

Se presentó la primera plataforma puramente pasiva para Z2 NHSE en acústica.
Se abrieron vías para el control de ondas de espín-móvil en metamateriales topológicos no hermitianos.
Este trabajo proporciona un nuevo sistema para estudiar fenómenos topológicos en acústica.

Palabras clave:

acústica cristales sónicos efecto de piel no hermitiano topología polarización de espín metamateriales

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