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La selectividad de espín inducida por quiral permite un diodo emisor de luz de espín a temperatura ambiente
Young-Hoon Kim1, Yaxin Zhai1, Haipeng Lu1
1Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO 80401, USA.
Science (New York, N.Y.)
|March 12, 2021
Resumen
Este estudio introduce un nuevo LED de espín que funciona sin campos magnéticos o contactos ferromagnéticos, utilizando la selectividad de espín inducida quiral (CISS) para la emisión de luz polarizada por espín a temperatura ambiente.
Área de la Ciencia:
- Optoelectrónica y sus derivados
- La tecnología Spintronics
- Ciencias de los materiales
Sus antecedentes:
- Los dispositivos optoelectrónicos tradicionales requieren campos eléctricos y magnéticos para el giro, la carga y el control de la luz.
- Los LED de espín suelen utilizar campos eléctricos para la inyección de portadores y campos magnéticos o contactos ferromagnéticos para la polarización de espín.
- Lograr el control de espín en la optoelectrónica sin campos magnéticos externos o materiales ferromagnéticos presenta un desafío significativo.
Objetivo del estudio:
- Para demostrar un diodo emisor de luz polarizado por espín (spin-LED) que funcione sin campos magnéticos o contactos ferromagnéticos.
- Aprovechar la selectividad de espín inducida por quiral (CISS) para generar portadores de espín polarizado.
- Para lograr el funcionamiento a temperatura ambiente de un LED giratorio basado en CISS.
Principales métodos:
- Se utilizó la selectividad de espín inducida quiral (CISS) para generar portadores de espín polarizado.
- Fabricado un LED de espín que incorpora una capa CISS compuesta de moléculas quirales orientadas y autoensambladas dentro de un marco de semiconductores híbrido.
- Funciona el dispositivo a temperatura ambiente sin necesidad de campos magnéticos externos o contactos ferromagnéticos.
Principales resultados:
- Se ha demostrado con éxito un LED de espín funcional que funciona a temperatura ambiente.
- Se obtiene una electroluminiscencia polarizada circular con una intensidad de ±2,6%.
- Confirmó la eficacia de la capa CISS en la producción de portadores polarizados por espín sin componentes magnéticos o ferromagnéticos.
Conclusiones:
- La selectividad de espín inducida por quiral (CISS) ofrece una vía viable para desarrollar LEDs de espín libres de campos magnéticos y ferromagnéticos.
- La tecnología spin-LED desarrollada funciona eficazmente a temperatura ambiente.
- Este enfoque avanza en el campo de la espintrónica y la optoelectrónica al permitir una emisión de luz polarizada por espín más simple y eficiente.
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