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. 2019 Sep 6;10:4047. doi: 10.1038/s41467-019-12129-1

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© The Author(s) 2019

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Fig. 3 — Resolving the valley degree of freedom of dark excitons by the Zeeman shift. a, b Contour plot of the PL spectrum of the OP channel as a function of magnetic field for a hole doped WSe₂ sample (both gates at −2.2 V). a is for the LCP excitation and b for the RCP excitation. The color bar represents the PL intensity. c–e PL spectra of the OP channel under RCP (black line) and LCP (red line) excitation. The out-of-plane field is about 8 T. The gate voltages −2.2 V (c), −0.5 V (d), and −1.75 V (e) correspond to a hole-doped, electron-doped, and neutral sample, respectively.