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Li, J.; Goryca, M.; Wilson, N. P.; Stier, A. V.; Xu, X.; Crooker, S. A.
Physical review letters, 10/2020, Volume: 125, Issue: 14Journal Article
We report magnetoabsorption spectroscopy of gated WSe2 monolayers in high magnetic fields up to 60 T. When doped with a 2D Fermi sea of mobile holes, well-resolved sequences of optical transitions are observed in both σ± circular polarizations, which unambiguously and separately indicate the number of filled Landau levels (LLs) in both K and K ′ valleys. This reveals the interaction-enhanced valley Zeeman energy, which is found to be highly tunable with hole density p . We exploit this tunability to align the LLs in K and K ′ , and find that the 2D hole gas becomes unstable against small changes in LL filling and can spontaneously valley polarize. These results cannot be understood within a single-particle picture, highlighting the importance of exchange interactions in determining the ground state of 2D carriers in monolayer semiconductors.
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