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Control ferroeléctrico de excitones intercapa en heterouniones 3R-MoS2/MoSe2

Johannes Schwandt-Krause1, Mohammed El Amine Miloudi1, Elena Blundo2,3

  • 1Institute of Physics, University of Rostock, 18059 Rostock, Germany.

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Los excitones intercapa en heterouniones 3R-MoS2/MoSe2 interactúan con dominios ferroeléctricos. Esta interacción permite ajustar la energía del excitón mediante control eléctrico, allanando el camino para nuevos dispositivos optoelectrónicos.

Palabras clave:
excitones intercapaespectroscopía ópticaferroelectricidad deslizanteheterouniones de van der Waals

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Área de la Ciencia:

  • Física de la Materia Condensada
  • Ciencia de Materiales
  • Óptica Cuántica

Sus antecedentes:

  • Las heterouniones de van der Waals ofrecen propiedades electrónicas y ópticas únicas.
  • Los materiales ferroeléctricos exhiben polarización eléctrica espontánea, conmutable por un campo eléctrico externo.
  • Los excitones intercapa, pares electrón-hueco ligados en heterouniones, son sensibles a su entorno.

Objetivo del estudio:

  • Investigar la interacción entre excitones intercapa y dominios ferroeléctricos en heterouniones 3R-MoS2/MoSe2 encapsuladas en hBN.
  • Comprender cómo la polarización del dominio ferroeléctrico afecta las energías de los excitones intercapa.
  • Explorar la sintonización eléctrica de los excitones intercapa mediante el cambio de dominios ferroeléctricos.

Principales métodos:

  • Espectroscopía de fotoluminiscencia a baja temperatura.
  • Cálculos de teoría de la funcional de la densidad (DFT).
  • Cálculos de la función de Green de muchos cuerpos.
  • Experimentos de modulación de voltaje de puerta.

Principales resultados:

  • Se observó un corrimiento al rojo significativo en la energía del excitón intercapa con el aumento del espesor de la capa de MoS2, atribuido a la renormalización de banda y efectos dieléctricos.
  • Se encontró que las variaciones locales en la energía del excitón se correlacionan con la polarización del dominio ferroeléctrico de la capa 3R-MoS2, mostrando distintas energías de transición dependientes del dominio.
  • Se logró la sintonización eléctrica de la energía del excitón intercapa cambiando eléctricamente los dominios ferroeléctricos.

Conclusiones:

  • El estudio demuestra un fuerte acoplamiento entre los excitones intercapa y los dominios ferroeléctricos en las heterouniones 3R-MoS2/MoSe2.
  • El orden ferroeléctrico local proporciona un mecanismo para controlar las propiedades de los excitones intercapa.
  • Estos hallazgos sientan las bases para el desarrollo de dispositivos optoelectrónicos ferroeléctricos avanzados que utilizan heterouniones de van der Waals.