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Descubrimiento de la superficie de Fermi segmentada inducida por el momento del par de Cooper
Zhen Zhu1, Michał Papaj2, Xiao-Ang Nie1
1School of Physics and Astronomy, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China.
Science (New York, N.Y.)
|October 28, 2021
Resumen
Una gran supercorriente puede crear un estado superconductor sin huecos cambiando la energía de las cuasipartículas. Este estudio muestra la superficie de Fermi segmentada en películas delgadas de telururo de bismuto, revelando el impacto del momento finito del par de Cooper.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- Los fenómenos cuánticos
Sus antecedentes:
- Las supercorrientes pueden inducir un estado sin brecha en los superconductores a través del desplazamiento Doppler.
- El momento del par de Cooper finito conduce a cuasipartículas de energía cero en partes de la superficie de Fermi.
Objetivo del estudio:
- Para obtener imágenes de la superficie de Fermi controlada por campo de películas delgadas de telururo de bismuto (Bi2Te3).
- Para investigar el efecto de proximidad del superconductor de deselenuro de niobio (NbSe2).
- Para entender el impacto del momento del par de Cooper finito en el espectro de las cuasipartículas.
Principales métodos:
- Imágenes de interferencia de cuasi partículas.
- Estudios de efecto de proximidad.
- Aplicación de campos magnéticos en el plano.
Principales resultados:
- Se han observado distintos patrones de interferencia que indican un estado superconductor sin brechas.
- Identificó una superficie de Fermi segmentada en películas delgadas de Bi2Te3.
- Se ha demostrado el emparejamiento de momento finito en estados de superficie topológicos.
Conclusiones:
- El momento del par de Cooper finito tiene un impacto significativo en el espectro de cuasipartículas en los superconductores.
- El estudio proporciona evidencia de un estado superconductor sin brechas controlado por el campo.
- La interferencia de cuasipartículas es una herramienta poderosa para sondear estados superconductores.
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