|Conţinutul numărului revistei|
| SM ISO690:2012|
MITIOGLU, Anatolie; ANGHEL, Sergiu; BALLOTTIN, Mariana; SUSHKEVICH, Konstantin; KULIUC, 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 -.
|Physical Review B|
|Numărul 15(99) / 2019 / ISSN - /ISSNe 0163-1829|
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.
Landforms, Magnetic fields, Monolayers, Photoluminescence spectroscopy, polarization, Selenium compounds, temperature