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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
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Insulador topológico de excitón-polaritón
S Klembt1, T H Harder2, O A Egorov2
1Technische Physik and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Universität Würzburg, Würzburg, Germany. sebastian.klembt@physik.uni-wuerzburg.de.
Nature
|October 10, 2018
Resumen
Este estudio demuestra la primera realización experimental de un aislante topológico utilizando excitones-polaritones. Este nuevo sistema exhibe un transporte de borde robusto y unidireccional de cuasipartículas de materia ligera, allanando el camino para nuevos fenómenos topológicos.
Área de la Ciencia:
- Física de la materia condensada
- La óptica cuántica
- Ciencias de los materiales
Sus antecedentes:
- Los aislantes topológicos exhiben estados de borde robustos debido a las invariantes topológicas, lo que permite el transporte unidireccional.
- Estos conceptos se han expandido más allá de los sistemas electrónicos a la fotónica, los átomos fríos y la mecánica.
- Trabajos anteriores sugirieron aislantes topológicos en sistemas excitón-polaritón utilizando redes de panal y campos magnéticos.
Objetivo del estudio:
- Para demostrar experimentalmente un aislante topológico en un sistema excitón-polaritón.
- Investigar los fenómenos topológicos únicos que surgen de la interacción luz-materia en estas cuasipartículas.
- Explorar el potencial para el transporte unidireccional robusto en redes de excitón-polaritón diseñadas.
Principales métodos:
- Fabricación de una red de microcavidades acopladas de semiconductores.
- Excitación láser sin resonancia y aplicación de un campo magnético.
- Técnicas de escaneo de imágenes en el espacio real y de Fourier para medir la fotoluminiscencia.
Principales resultados:
- Realización experimental de un aislante topológico excitón-polaritón.
- Observación del transporte unidireccional en modo de borde quiral de paquetes de ondas de polaritones.
- Demostrar la robustez del modo de borde frente a los defectos y la inversión de la dirección de propagación mediante la inversión del campo magnético.
Conclusiones:
- Los aislantes topológicos de excitón-polaritón ofrecen una nueva plataforma para el estudio de la física topológica.
- Este trabajo destaca el potencial para la interacción de la materia ligera, la amplificación y los efectos de muchos cuerpos no lineales en sistemas topológicos.
- Los hallazgos abren caminos para nuevas aplicaciones en fotónica topológica y procesamiento de información cuántica.
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