Ambipolar Landau levels and strong band-selective carrier interactions in monolayer WSe${}_2$

Abstract

Monolayers (MLs) of transition metal dichalcogenides (TMDs) exhibit unusual electrical behavior under magnetic fields due to their intrinsic spin-orbit coupling and lack of inversion symmetry. While recent experiments have also identified the critical role of carrier interactions within these materials, a complete mapping of the ambipolar Landau level (LL) sequence has remained elusive. Here, we use single-electron transistors to perform LL spectroscopy in ML WSe${}_2$, for the first time providing a comprehensive picture of the electronic structure of a ML TMD for both electrons and holes. We find that the LLs differ notably between the two bands, and follow a unique sequence in the valence band (VB) that is dominated by strong Zeeman effects. The Zeeman splitting in the VB is several times higher than the cyclotron energy, far exceeding the predictions of a single-particle model, and moreover tunes significantly with doping. This implies exceptionally strong many-body interactions, and suggests that ML WSe${}_2$ can serve as a host for new correlated-electron phenomena.

arXiv comment22 pages, 11 figures

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Cited by in corpus (39)

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• Possible Realization and Protection of Valley-Polarized Quantum Hall Effect in Mn/WS2
• Intervalley Polaron in Atomically Thin Transition Metal Dichalcogenides
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• Large g factor in bilayer WS${}_2$ flakes
• Synthesizing Coulombic superconductivity in van der Waals bilayers
• Exciton solid in bilayer two dimensional electron-hole systems
• Structural Modulation and Enhanced Magnetic Ordering in Incommensurate K${}_{1-x}$CrSe${}_2$ Crystals
• Pomeranchuk Effect and Tunable Quantum Phase Transitions in 3L-MoTe2/WSe2
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• Excited Rydberg States in TMD Heterostructures