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Gran desplazamiento de Bloch-Siegert exclusivo del valle en una sola capa WS
Edbert J Sie1, Chun Hung Lui2, Yi-Hsien Lee3
1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|March 11, 2017
Resumen
Los investigadores observaron un gran desplazamiento de Bloch-Siegert en la monocapa de disulfuro de tungsteno (WS2), lo que permite un control exclusivo del valle. Este avance mejora las propiedades valleytrónicas de los materiales 2D.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- La óptica cuántica
Sus antecedentes:
- La interacción coherente con la luz fuera de resonancia cambia los niveles de energía atómica y material.
- El desplazamiento óptico de Stark es dominante, mientras que el desplazamiento de Bloch-Siegert se entiende menos en sólidos.
- Valleytronics en materiales 2D ofrece nuevas funcionalidades electrónicas.
Objetivo del estudio:
- Para observar y caracterizar el desplazamiento de Bloch-Siegert en un sistema de estado sólido.
- Para demostrar el control exclusivo del valle de los efectos ópticos en materiales 2D.
- Para explorar un mayor control sobre las propiedades valleytrónicas.
Principales métodos:
- Utilizó el disulfuro de tungsteno monocapa (WS2) como sistema de materiales.
- Se utiliza la conducción óptica infrarroja para una interacción coherente.
- Helicidad de luz controlada para diferenciar los efectos ópticos en diferentes valles.
Principales resultados:
- Se observó un desplazamiento de Bloch-Siegert excepcionalmente grande en la monocapa WS2.
- Logrado confinamiento exclusivo del valle de los cambios ópticos de Bloch-Siegert y Stark.
- Se demostraron reglas de selección opuestas para estos turnos en diferentes valles.
Conclusiones:
- El gran desplazamiento de Bloch-Siegert exclusivo del valle proporciona una nueva vía para manipular las propiedades del valle.
- Este trabajo allana el camino para el control avanzado en dispositivos valleytronic.
- La monocapa WS2 es una plataforma prometedora para estudiar y utilizar tales efectos ópticos cuánticos.
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