|Conţinutul numărului revistei|
| SM ISO690:2012|
MITIOGLU, Anatolie; BUHOT, Jonathan; BALLOTTIN, Mariana; ANGHEL, Sergiu; SUSHKEVICH, Konstantin; KULYUK, Leonid; CHRISTIANEN, Peter. Observation of bright exciton splitting in strained WSe2 monolayers. In: Physical Review B. 2018, nr. 23(98), p. 0. ISSN -.
|Physical Review B|
|Numărul 23(98) / 2018 / ISSN - /ISSNe 0163-1829|
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.