Fig. 4: Excitation energy dependent spin-valley depletion and PL polarization reversal.
From: Intrinsic donor-bound excitons in ultraclean monolayer semiconductors
All data are from Device #1 at Vb = 0.5 V. a PL spectra with a HeNe laser excitation. b Polarization-resolved PL spectra by sweeping σ+polarized excitation from 1.75 to 1.65 eV. The σ+ and σ− components of the PL are shown in the left and middle panels, respectively, while the right panel shows the extracted degree of polarization η. c Polarization-dependent PL with the excitation in resonance with the free intervalley (top, 1.706 eV) and intravalley (bottom, 1.699 eV) trions, showing polarization reversal of the exciton satellite PL.
