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Superconductor mesoscópico como un interruptor cuántico balístico

A S Mel'nikov1, V M Vinokur

  • 1Institute for Physics of Microstructures, Russian Academy of Sciences, 603950, Nizhny Novgorod, GSP-105, Russia.

Nature
|January 10, 2002
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores exploraron las estructuras de vórtice en los superconductores mesoscópicos. Descubrieron que el control de los cuantos de flujo magnético y sus configuraciones puede ajustar el transporte cuántico, lo que permite un nuevo interruptor cuántico basado en vórtices.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada
  • La mecánica cuántica es la mecánica cuántica.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los superconductores mesoscópicos exhiben complejas estructuras de vórtice, incluyendo moléculas de vórtice tipo polígono y vórtices gigantes, con pocos cuantos de flujo magnético atrapados.
  • La teoría de Ginzburg-Landau confirma las transiciones de fase entre los estados de vórtice gigante y las configuraciones similares a las moléculas.

Objetivo del estudio:

  • Investigar teóricamente la estructura electrónica de los sistemas de superconductores mesoscópicos con configuraciones de vórtice específicas.
  • Para analizar las propiedades de transporte coherente de fase influenciadas por estas estructuras de vórtice y el flujo magnético atrapado.

Principales métodos:

  • Estudio teórico de las excitaciones de cuasipartículas dentro de núcleos de vórtice.
  • Análisis de los cálculos de Ginzburg-Landau para las transiciones de estado de vórtice.
  • Modelado de la conductividad de la muestra basado en la transparencia de múltiples vórtices y canales cuánticos.

Principales resultados:

  • Las excitaciones de cuasipartículas forman estados coherentes de mecánica cuántica dentro de los vórtices.
  • La conductividad de la muestra está dictada por la transparencia de las configuraciones de múltiples vórtices, que actúan como canales cuánticos.
  • Múltiples reflexiones de Andreev dentro de los núcleos de vórtice y en los bordes de la muestra controlan los coeficientes de transmisión.

Conclusiones:

  • El transporte de fase coherente en superconductores mesoscópicos puede ser controlado mediante la manipulación de los cuantos de flujo magnético y las configuraciones de vórtice.
  • Los fenómenos de interferencia conducen a un comportamiento de conductancia gradual con el campo magnético aplicado.
  • Los efectos observados pueden utilizarse para desarrollar un interruptor cuántico basado en vórtices, utilizando el campo magnético como voltaje de puerta.