Excitonic Valley Effects in Monolayer WS2 under High Magnetic Fields

Transition-metal dichalcogenides can be easily produced as atomically thin sheets, exhibiting the possibility to optically polarize and read out the valley pseudospin of extremely stable excitonic quasiparticles present in these 2D semiconductors.Here, we investigate a monolayer of tungsten disulphide in high magnetic fields up to 30 T via photoluminescence spectroscopy