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Observation of intervalley quantum interference in epitaxial monolayer tungsten diselenide

The extraordinary electronic structures of monolayer transition metal dichalcogenides, such as the spin–valley-coupled band edges, have sparked great interest for potential spintronic and valleytronic applications based on these two-dimensional materials. In this work, we report the experimental obs...

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Detalles Bibliográficos
Autores principales: Liu, Hongjun, Chen, Jinglei, Yu, Hongyi, Yang, Fang, Jiao, Lu, Liu, Gui-Bin, Ho, Wingking, Gao, Chunlei, Jia, Jinfeng, Yao, Wang, Xie, Maohai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4569794/
https://www.ncbi.nlm.nih.gov/pubmed/26324205
http://dx.doi.org/10.1038/ncomms9180
Descripción
Sumario:The extraordinary electronic structures of monolayer transition metal dichalcogenides, such as the spin–valley-coupled band edges, have sparked great interest for potential spintronic and valleytronic applications based on these two-dimensional materials. In this work, we report the experimental observation of quasi-particle interference patterns in monolayer WSe(2) using low-temperature scanning tunnelling spectroscopy. We observe intervalley quantum interference involving the Q valleys in the conduction band due to spin-conserving scattering processes, while spin-flipping intervalley scattering is absent. Our results establish unequivocally the presence of spin–valley coupling and affirm the large spin splitting at the Q valleys. Importantly, the inefficient spin-flipping scattering implies long valley and spin lifetime in monolayer WSe(2), which is a key figure of merit for valley-spintronic applications.