Fig. 4
From: Enhancing and controlling valley magnetic response in MoS2/WS2 heterostructures by all-optical route
Magnetic control of valley polarization in MoS2/WS2 heterostructures. a–f Polarization-resolved photoluminescence under σ+ excitation (a–c) and σ− excitation (d–f) for magnetic fields of 7 T (a, d), 0 T (b, e), and −7 T (c, f). g Degree of valley polarization for fundamental optical transitions of MoS2 and WS2. The error bars are from the fitting uncertainties of the PL peak intensities. h Dispersions of exciton energy spectrum with and without a magnetic field. Magenta and green represent the superposition of σ+ and σ−, and blue (red) denotes σ+ (σ−). i Exciton formation with valley-conserving process (γ1) and valley-flipping process (γ2) under σ+ (left) and σ− (right) excitation for positive magnetic field
