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Superconductividad inducida por puertas en un aislante topológico monocapa

Ebrahim Sajadi¹, Tauno Palomaki², Zaiyao Fei²

¹Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada, and Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.

Science (New York, N.Y.)

|October 27, 2018

Resumen

La superconductividad se induce en el ditelururo de tungsteno monocapa (WTe2), un aislante topológico 2D, a través del dopaje electrostático. Este avance permite que los dispositivos controlados por puertas fusionen la superconductividad y las propiedades topológicas para aplicaciones de información cuántica.

Área de la Ciencia:

Física de la materia condensada
Ciencias de los materiales
Ciencia de la información cuántica

Sus antecedentes:

El ditelururo de tungsteno (WTe2) es un semimetal en capas.
La monocapa WTe2 presenta las propiedades de un aislante topológico bidimensional (2D TI) con canales de borde conductores.

Objetivo del estudio:

Para investigar la inducción de la superconductividad en la monocapa 2D TI WTe2.
Explorar la posibilidad de transiciones controladas por puertas entre los estados de aislamiento topológico y superconductor.

Principales métodos:

Disminución del WTe2 en una sola capa.
Aplicando un ligero dopaje electrostático.
Utilizando el control de la tensión de la puerta a temperaturas inferiores a 1 Kelvin.

Principales resultados:

La superconductividad intrínseca fue inducida con éxito en la monocapa WTe2.
La transición entre los estados 2D TI y superconductor fue controlada por el voltaje de la puerta.
Los fenómenos observados se produjeron a temperaturas inferiores a 1 Kelvin.

Conclusiones:

El dopaje electrostático leve puede inducir la superconductividad en la monocapa 2D TI WTe2.
Los dispositivos controlados por puertas que combinan superconductividad y propiedades topológicas son factibles.
Esta investigación proporciona una base para los esquemas de información cuántica topológica.

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