2017/07/31 by Martin V. Gustafsson, M. Gustafsson, Matthew Yankowitz +7 · 3 citations
Chemistry · Materials Science · Physics and Astronomy · #2D Materials and Applications #Ambipolar diffusion #Chemistry #Condensed matter physics #Electron #Graphene research and applications #Landau quantization #Magnetic field #Materials science #Monolayer #Nanotechnology #Physics #Quantum mechanics #Topological Materials and Phenomena #Zeeman effect #cond-mat.mes-hall
paper · pdf · doi:10.1038/s41563-018-0036-2
published as Nature Materials 17 (2018) 411-415 · 22 pages, 11 figures
arxiv created 2017/10/05 · openalex created_date 2017/10/20 · openalex publication_date 2018/03/26 · arxiv updated 2018/05/11 · openalex updated_date 2026/08/05
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 WSe2, 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 WSe2 can serve as a host for new correlated-electron phenomena.