Fig. 5.

The valley polarization of excitonic bound states in a finite out-of-plane magnetic field. a–d The luminescence spectra of X, D, XD, and TD emission in σ⁺ and σ⁻ channels at 8 Tesla. Valley polarization is defined as $P_{\mathrm{V}}=\left(I^{{\sigma }^{+}}-I^{{\sigma }^{-}}\right)\mathrm{∕}\left(I^{{\sigma }^{+}}+I^{{\sigma }^{-}}\right)$. e The schematics of the spin-valley configuration of the XD and TD bound states