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SM ISO690:2012 MITIOGLU, Anatolie, BUHOT, Jonathan, BALLOTTIN, Mariana, ANGHEL, Sergiu, SUSHKEVICH, Konstantin, KULYUK, Leonid, CHRISTIANEN, Peter C.M.. Observation of bright exciton splitting in strained WSe2 monolayers. In: Physical Review B, 2018, vol. 98, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.98.235429 |
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Physical Review B | |||||
Volumul 98 / 2018 / ISSN 2469-9950 /ISSNe 2469-9969 | |||||
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DOI: https://doi.org/10.1103/PhysRevB.98.235429 | |||||
Pag. 0-0 | |||||
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High-resolution magnetophotoluminescence measurements of strained WSe2 monolayers are reported. At low temperature, a splitting of a few meV in the neutral exciton peak is observed, which is attributed to the theoretically predicted in-plane (xy) anisotropy splitting. Measurements in high magnetic fields up to 30 T demonstrate that strain and intervalley electron-hole exchange mix the valley-exciton energy levels, leading to a relaxation of the valley-selective optical selection rules and to strongly modified exciton g factors. Our observation of the bright exciton splitting provides crucial information about the dispersion of valley excitons and paves the way to develop valley functionality for photonic devices. |
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Cuvinte-cheie Excitons, Landforms, Monolayers, Photonic devices, Selenium compounds, temperature |
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