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Transición óptica inducida por el trastorno de espín Hall al efecto Rashba aleatorio

Elhanan Maguid¹, Michael Yannai¹, Arkady Faerman¹

¹Micro and Nanooptics Laboratory, Faculty of Mechanical Engineering, and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 3200003, Israel.

Science (New York, N.Y.)

|December 16, 2017

Resumen

Las estructuras desordenadas revelan nuevos fenómenos de transporte óptico fotónico. El desorden débil causa un efecto Hall de espín, mientras que el desorden fuerte induce modos de división de espín, mostrando interacciones complejas entre la luz y la materia.

Área de la Ciencia:

La fotónica
Física de la materia condensada
La óptica cuántica

Sus antecedentes:

Las estructuras desordenadas exhiben interacciones complejas con la luz.
La fase geométrica en fotónica es crucial para la manipulación de la luz.
El acoplamiento de espín-órbita influye en los fenómenos ópticos.

Objetivo del estudio:

Investigar la ruptura de la simetría de espín en estructuras de fase geométricas desordenadas.
Explorar nuevos fenómenos de transporte de espín óptico.
Comprender el papel de la fuerza y la topología del desorden.

Principales métodos:

Fabricación de estructuras geométricas de fase desordenadas a escala de longitud de onda.
Utilizando mediciones débiles cuánticas para observar los efectos.
Analizando la entropía del espacio de momento y las características topológicas.

Principales resultados:

Efecto Hall de espín fotónico observado bajo desorden débil.
Se identificaron modos de espín dividido (efecto Rashba óptico aleatorio) bajo un fuerte desorden.
Reveló una transición óptica vinculada a la desaparición de la anisotropía y demostró interacciones de vórtice.

Conclusiones:

Las estructuras de fase geométricas desordenadas permiten la ruptura de la simetría de espín fotónica.
Estas estructuras sirven como plataforma para estudiar el acoplamiento de espín-órbita en medios complejos.
Los nuevos fenómenos de transporte de espín óptico son accesibles a través de un desorden controlado.

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