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La superconductividad de afinación en el grafeno de doble capa retorcida

Matthew Yankowitz1, Shaowen Chen1,2, Hryhoriy Polshyn3

  • 1Department of Physics, Columbia University, New York, NY 10027, USA.

Science (New York, N.Y.)
|January 26, 2019
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Resumen

Los investigadores ajustaron la superconductividad en el grafeno de doble capa retorcida ajustando el espaciamiento de las capas con la presión. Esto revela nuevas formas de explorar estados cuánticos exóticos en este material sintonizable.

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Área de la Ciencia:

  • Física de la materia condensada
  • Ciencias de los materiales cuánticos

Sus antecedentes:

  • Las bandas electrónicas planas en los materiales pueden conducir a fenómenos cuánticos exóticos debido a fuertes correlaciones de electrones.
  • El grafeno de doble capa retorcido (TBG) con un ángulo de torsión específico (1,1 °) exhibe fases superconductoras ajustables a puertas y fases aislantes correlacionadas.

Objetivo del estudio:

  • Investigar la adaptabilidad de las fases superconductoras y aislantes correlacionadas en TBG.
  • Explorar el papel del acoplamiento entre capas, más allá del ángulo de torsión, en el control de estas fases electrónicas.

Principales métodos:

  • Fabricación de dispositivos de grafeno retorcido de dos capas de bajo desorden.
  • Aplicación de presión hidrostática para variar el espacio entre capas y el acoplamiento.
  • Ajuste de las fases electrónicas a través de la tensión y la presión de la puerta.

Principales resultados:

  • La superconductividad se indujo en ángulos de torsión superiores a 1,1 °, donde las fases correlacionadas suelen estar ausentes, mediante la aplicación de presión hidrostática.
  • La variación del espacio entre capas con la presión permitió una afinación precisa de las fases superconductoras y aislantes.
  • Se mapearon y analizaron diagramas de fase superconductores detallados en relación con los estados aislantes adyacentes.

Conclusiones:

  • El acoplamiento entre capas es un parámetro crítico para ajustar los estados electrónicos correlacionados en TBG, junto con el ángulo de torsión.
  • La presión hidrostática ofrece un nuevo método para diseñar la superconductividad y los fenómenos correlacionados en TBG.
  • El grafeno de doble capa retorcido sirve como una plataforma muy versátil para la investigación fundamental en estados cuánticos correlacionados.