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arXiv · 1903.09329

Large g factor in bilayer WS$_2$ flakes

Sibai Sun·Yang Yu·Jianchen Dang·Kai Peng·Xin Xie·Feilong Song·Chenjiang Qian·Shiyao Wu·Hassan Ali·Jing Tang·Jingnan Yang·Shan Xiao·Shilu Tian·Meng Wang·Xinyan Shan·M. A. Rafiq·Can Wang·Xiulai Xu
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Abstract

The valley of transition metal dichalcogenides provides an additional platform to manipulate spin due to its unique selection rule. Normally, intralayer optical transitions in magnetic field show a Zeeman splitting with g factor of about $-4$. Here we report remarkable valley Zeeman effect exhibited by splitting of excitonic emission in a bilayer WS$_{2}$, with a value of g factor as large as $-16.5$. The observed large g factor results from the interlayer recombination, as the conduction band and valence band are modified in opposite directions by magnetic field in different layers. The interlayer recombination is due to the defect induced inversion symmetry breaking, which is theoretically not accessible in ideal bilayer WS$_{2}$ with inversion symmetry. Large g factor of interlayer emission offers potential benefits for future optical spin control and detection.

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Sibai Sun, Yang Yu, Jianchen Dang, Kai Peng, Xin Xie, Feilong Song, Chenjiang Qian, Shiyao Wu, Hassan Ali, Jing Tang, Jingnan Yang, Shan Xiao, Shilu Tian, Meng Wang, Xinyan Shan, M. A. Rafiq, Can Wang, Xiulai Xu. 2019-03-22. Large g factor in bilayer WS$_2$ flakes. https://doi.org/10.1063/1.5087440

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