2017/03/03 by T. Smoleński, Smoleński, Tomasz, T. Kazimierczuk +13 · 1 citation
Engineering · Materials Science · #2D Materials and Applications #FOS: Physical sciences #Graphene research and applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Perovskite Materials and Applications
paper · pdf · doi:10.48550/arxiv.1703.01129
openalex publication_date 2017/03/03 · openalex created_date 2019/07/30 · openalex updated_date 2026/07/28
Optical orientation of localized/bound excitons is shown to be effectively\nenhanced by the application of magnetic fields as low as 20 mT in monolayer\nWS2. At low temperatures, the evolution of the polarization degree of\ndifferent emission lines of monolayer WS2 with increasing magnetic fields is\nanalyzed and compared to similar results obtained on a WSe2 monolayer. We\nstudy the temperature dependence of this effect up to T=60 K for both\nmaterials, focusing on the dynamics of the valley pseudospin relaxation. A rate\nequation model is used to analyze our data and from the analysis of the width\nof the polarization deep in magnetic field we conclude that the competition\nbetween the dark exciton pseudospin relaxation and the decay of the dark\nexciton population into the localized states are rather different in these two\nmaterials which are representative of the two extreme cases for the ratio of\nrelaxation rate and depolarization rate.\n