Observation of bright exciton splitting in strained WSe2 monolayers
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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

Observation of bright exciton splitting in strained WSe2 monolayers

DOI: https://doi.org/10.1103/PhysRevB.98.235429

Pag. 0-0

Mitioglu Anatolie12, Buhot Jonathan2, Ballottin Mariana2, Anghel Sergiu13, Sushkevich Konstantin4, Kulyuk Leonid1, Christianen Peter C.M.2
 
1 Institute of Applied Physics,
2 Radboud University,
3 Technical University of Dortmund,
4 Moldova State University
 
Disponibil în IBN: 3 februarie 2019


Rezumat

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.

Cuvinte-cheie
Excitons, Landforms, Monolayers, Photonic devices, Selenium compounds, temperature

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<title xml:lang='en'>Observation of bright exciton splitting in strained WSe2 monolayers</title>
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<publicationYear>2018</publicationYear>
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<subject>Excitons</subject>
<subject>Landforms</subject>
<subject>Monolayers</subject>
<subject>Photonic devices</subject>
<subject>Selenium compounds</subject>
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<description xml:lang='en' descriptionType='Abstract'><p>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.</p></description>
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