Anomalous rotation of the linearly polarized emission of bright excitons in strained WSe2 monolayers under high magnetic fields
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MITIOGLU, Anatolie; ANGHEL, Sergiu; BALLOTTIN, Mariana; SUSHKEVICH, Konstantin; KULYUK, Leonid; CHRISTIANEN, Peter. Anomalous rotation of the linearly polarized emission of bright excitons in strained WSe2 monolayers under high magnetic fields. In: Physical Review B. 2019, nr. 15(99), p. 0. ISSN -.
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Physical Review B
Numărul 15(99) / 2019 / ISSN - /ISSNe 0163-1829

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


DOI: 10.1103/PhysRevB.99.155414
Pag. 0-0

Mitioglu Anatolie12, Anghel Sergiu13, Ballottin Mariana2, Sushkevich Konstantin4, Kulyuk Leonid1, Christianen Peter2
 
1 Institute of Applied Physics,
2 High Field Magnet Laboratory, Institute for Molecules and Materials, Radboud University,
3 Technical University of Dortmund,
4 State University of Moldova
 
Disponibil în IBN: 28 mai 2019


Rezumat

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