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Cuantización observada del flujo de calor aniónico
Mitali Banerjee1, Moty Heiblum1, Amir Rosenblatt1
1Braun Center for Sub-Micron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Nature
|April 21, 2017
Resumen
El cuántico de la conductividad térmica, una constante fundamental, ahora se verifica experimentalmente en sistemas fuertemente interactuantes. Este estudio demuestra su cuantización en estados Hall cuánticos fraccionarios, revelando conocimientos sobre el flujo de calor aniónico.
Área de la Ciencia:
- Física de la materia condensada
- Física Cuántica
Sus antecedentes:
- La cantidad de conductividad térmica es una constante fundamental para los canales balísticos.
- La verificación experimental de la cuantización de la conductancia térmica ha sido un desafío, especialmente en sistemas que interactúan fuertemente.
- El efecto Hall cuántico fraccionario implica la fraccionamiento de electrones en cualquierones, con la posible aparición de fermiones de Majorana.
Objetivo del estudio:
- Demostrar experimentalmente la cuantización de la conductividad térmica en sistemas fuertemente interactuantes, específicamente en estados cuánticos fraccionarios de Hall.
- Para investigar la conductividad térmica en ambos estados de partículas y agujeros dentro de un gas de electrones bidimensional.
- Explorar cómo se puede acceder a las propiedades topológicas y al flujo de calor aniónico en estos sistemas a través de mediciones de conductividad térmica.
Principales métodos:
- Las mediciones de la conductividad térmica se realizaron en un gas de electrones bidimensional de alta movilidad en heteroestructuras GaAs-AlGaAs.
- El estudio se centró en los estados de tipo partícula (serie Laughlin-Jain) y de tipo agujero dentro del régimen cuántico fraccionario de Hall.
- El análisis consistió en caracterizar la contribución de los modos de borde quiral (cargado y neutro) al transporte térmico.
Principales resultados:
- La cuantización de la conductividad térmica se estableció con éxito tanto para los estados cuánticos fraccionarios de Hall como para los de partículas y agujeros.
- Los resultados confirman la universalidad de la cuantización de la conductividad térmica en diferentes tipos de sistemas electrónicos fraccionados.
- Las mediciones revelaron que la conductividad térmica en estados similares a agujeros está determinada por la quiralidad neta de todos los modos de borde.
Conclusiones:
- Los resultados experimentales validan la predicción teórica de la conductividad térmica cuantizada en sistemas electrónicos fuertemente correlacionados.
- Las mediciones del flujo de calor aniónico ofrecen una visión única de las propiedades topológicas que no son accesibles solo a través de la conductividad eléctrica.
- Este trabajo establece una nueva vía para sondear fenómenos cuánticos exóticos en sistemas de materia condensada.
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