Fig. 4: Electrically-tunable valley polarization of the IXs.
From: Nonvolatile electrical switching of optical and valleytronic properties of interlayer excitons
a Helicity-resolved PL spectra of the HS under 633 nm excitation (180 μW) at 78 K. b Absolute circular polarization degree of the IXs as a function of Vg. The helicity contrast is defined as \({P}_{{\mathrm{c}}2}/{P}_{{\mathrm{c}}3}\), where \({P}_{{\mathrm{c}}2}\) and \({P}_{{\mathrm{c}}3}\) is the absolute circular polarization degree at 0V-2 and 0V-3, respectively. The error bars in b represent the uncertainty of the data extraction
