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Los campos pseudo-magnéticos inducidos por la tensión son mayores de 300 teslas en las nanoburbujas de grafeno
N Levy1, S A Burke, K L Meaker
1Department of Physics, University of California Berkeley, Berkeley, CA 94720, USA.
Science (New York, N.Y.)
|July 31, 2010
Resumen
La ingeniería de deformación en el grafeno crea poderosos campos pseudo-magnéticos, lo que permite nuevos estudios de las propiedades electrónicas. Esta investigación demuestra el control sobre el grafeno.
Área de la Ciencia:
- Física de la materia condensada Física de la materia condensada
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Las propuestas teóricas sugieren que la tensión puede diseñar los estados electrónicos del grafeno a través de campos pseudo-magnéticos.
- La estructura de banda única del grafeno (fermiones de Dirac sin masa) y la simetría C3v permiten este efecto de deformación.
Objetivo del estudio:
- Para verificar experimentalmente la creación de campos pseudo-magnéticos en el grafeno tensado.
- Para investigar las propiedades electrónicas de las nanoburbujas de grafeno bajo alta tensión.
Principales métodos:
- Se utilizó la microscopía de túnel de barrido (STM) para las mediciones espectroscópicas.
- Se analizaron nanoburbujas de grafeno de alta tensión cultivadas en una superficie de platino (111).
Principales resultados:
- Los niveles de Landau observados en nanoburbujas de grafeno tensadas.
- Se ha demostrado que los campos pseudo-magnéticos inducidos por la tensión superan los 300 teslas.
Conclusiones:
- La evidencia experimental confirma grandes campos pseudo-magnéticos generados por la tensión en el grafeno.
- Esto abre caminos para el estudio de los portadores de carga en regímenes de campos magnéticos extremos.
- Destaca el potencial del control mecánico para la "ingeniería de deformación" de la estructura electrónica del grafeno.
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