Anomalous rotation of the linearly polarized emission of bright excitons in strained WSe2 monolayers under high magnetic fields

Mitioglu Anatolie; Anghel Sergiu; Ballottin Mariana; Sushkevich Konstantin; Kulyuk Leonid; Christianen Peter C.M.

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MITIOGLU, Anatolie, ANGHEL, Sergiu, BALLOTTIN, Mariana, SUSHKEVICH, Konstantin, KULYUK, Leonid, CHRISTIANEN, Peter C.M.. Anomalous rotation of the linearly polarized emission of bright excitons in strained WSe2 monolayers under high magnetic fields. In: Physical Review B, 2019, vol. 99, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.99.155414

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Physical Review B

Volumul 99 / 2019 / ISSN 2469-9950 /ISSNe 2469-9969

Anomalous rotation of the linearly polarized emission of bright excitons in strained WSe2 monolayers under high magnetic fields

DOI:https://doi.org/10.1103/PhysRevB.99.155414

Pag. 0-0

Mitioglu Anatolie¹², Anghel Sergiu¹³, Ballottin Mariana², Sushkevich Konstantin⁴, Kulyuk Leonid¹, Christianen Peter C.M.²

¹ Institute of Applied Physics,
² High Field Magnet Laboratory, Institute for Molecules and Materials, Radboud University,
³ Technical University of Dortmund,
⁴ Moldova State University

Disponibil în IBN: 28 mai 2019

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Linearly polarized microphotoluminescence (μ-PL) measurements of strained WSe2 monolayers in out-of-plane high magnetic fields are presented. At low temperature, a splitting of the bright exciton emission into two exciton components is observed, which is attributed to an in-plane uniaxial strain based on the full polarization dependence of the photoluminescence spectrum. High magnetic field measurements directly reveal a distinct evolution of the linear polarization and allows us to extract the valley coherence time constants (Ts2∗) for both exciton components. For the high-energy transition of the exciton, the valley coherence time ≃0.45 ps, closely matching Ts2∗ of an unstrained monolayer (≃0.34 ps). For the low-energy exciton, however, Ts2∗ is four times larger, ≃1.97 ps. This valley coherence time observed here may be explored for future valleytronic applications.

Cuvinte-cheie
Landforms, Magnetic fields, Monolayers, Photoluminescence spectroscopy, polarization, Selenium compounds, temperature

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