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Strain-Induced Exciton Hybridization in WS 2 Monolayers Unveiled by Zeeman-Splitting Measurements

2022; American Physical Society; Volume: 129; Issue: 6 Linguagem: Inglês

10.1103/physrevlett.129.067402

1092-0145

Elena Blundo, Paulo E. Faria, Alessandro Surrente, Giorgio Pettinari, M. A. Prosnikov, Katarzyna Olkowska‐Pucko, Klaus Zollner, Tomasz Woźniak, Andrey Chaves, T. Kazimierczuk, Marco Felici, A. Babiński, Maciej R. Molas, Peter C. M. Christianen, Jaroslav Fabian, A. Polimeni,

Plasmonic and Surface Plasmon Research

Mechanical deformations and ensuing strain are routinely exploited to tune the band gap energy and to enhance the functionalities of two-dimensional crystals. In this Letter, we show that strain leads also to a strong modification of the exciton magnetic moment in WS_{2} monolayers. Zeeman-splitting measurements under magnetic fields up to 28.5 T were performed on single, one-layer-thick WS_{2} microbubbles. The strain of the bubbles causes a hybridization of k-space direct and indirect excitons resulting in a sizable decrease in the modulus of the g factor of the ground-state exciton. These findings indicate that strain may have major effects on the way the valley number of excitons can be used to process binary information in two-dimensional crystals.