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Criticidad cuántica ajustable y transporte superbalístico en un circuito Kondo de "carga"

Z Iftikhar¹, A Anthore^1,2, A K Mitchell³

¹Centre de Nanosciences et de Nanotechnologies (C2N), CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91120 Palaiseau, France.

Science (New York, N.Y.)

|May 5, 2018

Resumen

Los investigadores exploraron las transiciones de fase cuántica en materiales fuertemente correlacionados utilizando un simulador cuántico para el modelo Kondo de tres canales. Descubrieron escalas universales y una violación inesperada de la conductividad máxima, avanzando en nuestra comprensión de la criticidad cuántica.

Área de la Ciencia:

Física de la materia condensada
Ciencia de la información cuántica

Sus antecedentes:

Las transiciones de fase cuántica (QPT) son fundamentales en materiales fuertemente correlacionados, pero son difíciles de estudiar cuantitativamente debido a la complejidad microscópica.
Comprender la rica física cercana a la criticidad cuántica es un desafío significativo en la física de la materia condensada.

Objetivo del estudio:

Para analizar cuantitativamente la física compleja de las transiciones de fase cuántica en sistemas fuertemente correlacionados.
Investigar escalamientos y cruces universales en diferentes regímenes de criticidad cuántica.
Explorar el potencial de los simuladores cuánticos para el estudio de fenómenos fuertemente correlacionados.

Principales métodos:

Implementación de un circuito de simulador cuántico para el modelo Kondo de tres canales.
Observación y análisis detallado de la criticidad cuántica en dos regímenes distintos.
Medición de las propiedades de conductividad, incluidas las desviaciones del comportamiento esperado.

Principales resultados:

Reveló comportamientos de escalado universales hacia diferentes puntos fijos de baja temperatura.
Identificó múltiples cruces originados por la criticidad cuántica.
Descubrió una violación sin precedentes de la conductividad máxima esperada para los electrones libres balísticos.

Conclusiones:

El simulador cuántico proporciona una poderosa plataforma para el estudio de diversos fenómenos fuertemente correlacionados.
La violación observada de la conductividad máxima ofrece nuevos conocimientos sobre el transporte de electrones en sistemas críticos cuánticos.
Este trabajo avanza en la comprensión cuantitativa de las transiciones de fase cuántica en materiales complejos.

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