Observation of intervalley quantum interference in epitaxial monolayer tungsten diselenide

Hongjun Liu, Jinglei Chen, Hongyi Yu, Fang Yang, Lu Jiao, Gui-Bin Liu, Wingking Ho, Chunlei Gao, Jinfeng Jia, Wang Yao and Maohai Xie ()
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Hongjun Liu: The University of Hong Kong
Jinglei Chen: The University of Hong Kong
Hongyi Yu: The University of Hong Kong
Fang Yang: Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shanghai Jiao Tong University
Lu Jiao: The University of Hong Kong
Gui-Bin Liu: School of Physics, Beijing Institute of Technology
Wingking Ho: The University of Hong Kong
Chunlei Gao: Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shanghai Jiao Tong University
Jinfeng Jia: Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shanghai Jiao Tong University
Wang Yao: The University of Hong Kong
Maohai Xie: The University of Hong Kong

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract 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 WSe2 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 WSe2, which is a key figure of merit for valley-spintronic applications.

Date: 2015
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DOI: 10.1038/ncomms9180

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