Spin/valley pumping of resident electrons in WSe<sub>2</sub> and WS<sub>2</sub> monolayers.
Cédric Robert, Sangjun Park, Fabian Cadiz, Laurent Lombez, Lei Ren, Hans Tornatzky, A. C. H. Rowe, D. Paget, Fausto Sirotti, Min Yang, Dinh Van Tuan, Takashi Taniguchi, Bernhard Urbaszek, Kenji Watanabe, T. Amand, Hanan Dery, X. Marie
Abstract
monolayers. We observe that, using a continuous wave laser and appropriate doping and excitation densities, negative trion doublet lines exhibit circular polarization of opposite sign and the photoluminescence intensity of the triplet trion is more than four times larger with circular excitation than with linear excitation. We interpret our results as a consequence of a large dynamic polarization of resident electrons using circular light.
Topics & Concepts
TrionExcitationCircular polarizationElectronPhotoluminescenceMonolayerExcitonSpin polarizationAtomic physicsPolarization (electrochemistry)Spin (aerodynamics)Relaxation (psychology)Condensed matter physicsDopingOptical pumpingMaterials sciencePhysicsLaserOptoelectronicsChemistryOpticsNanotechnologyPhysical chemistryPsychologyMicrostripQuantum mechanicsThermodynamicsSocial psychology2D Materials and ApplicationsPerovskite Materials and ApplicationsGraphene research and applications