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The spectral signatures associated with different negatively charged excitoncomplexes (trions) in a WS$_2$ monolayer encapsulated in hBN, are analyzed fromlow temperature and polarization resolved reflectance contrast (RC) andphotoluminescence (PL) experiments, with an applied magnetic field. Based onresults obtained from the RC experiment, we show that the valley Zeeman effectaffects the optical response of both the singlet and the triplet trion speciesthrough the evolution of their energy and of their relative intensity, whenapplying an external magnetic field. Our analysis allows us to estimate a freeelectron concentration of $\sim 1.3 \cdot 10^{11}$ cm$^{-2}$. The observedevolutions based on PL experiments on the same sample are different and canhardly be understood within the same simple frame highlighting the complexityof relaxation processes involved in the PL response.

Valley polarization of singlet and triplet trions in WS$_2$ monolayer in magnetic fields