Fig. 5: X1 and X2 exciton energies along the phase diagram.
From: Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré WS2/WSe2 heterobilayer
Energy of the X1 (a) and X2 (b) PL emission as a function of gate voltage and pump intensities. The white areas correspond to the range of parameters where the corresponding peak completely vanishes. When X1 and X2 coexist, we extract the energy difference, as shown in (c).
