2015/06/11 by Anatolie Mitioglu, A. A. Mitioglu, P. Plochocka +8
Chemistry · Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Chemistry #Condensed matter physics #Diamagnetism #Dirac fermion #Energy level splitting #Exciton #Graphene #Graphene research and applications #Magnetic field #Magnetism #Monolayer #Paramagnetism #Perovskite Materials and Applications #Physics #Point reflection #Transition metal #Tungsten diselenide #cond-mat.mes-hall
paper · pdf · doi:10.1021/acs.nanolett.5b00626
just accepted in Nano Letters http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.5b00626 (equations corrected)
openalex publication_date 2015/06/11 · arxiv created 2015/06/15 · arxiv updated 2015/06/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Optical spectroscopy in high magnetic fields B ≤ 65 T is used to reveal the very different nature of carriers in monolayer and bulk transition metal dichalcogenides. In monolayer WSe2, the exciton emission shifts linearly with the magnetic field and exhibits a splitting that originates from the magnetic field induced valley splitting. The monolayer data can be described using a single particle picture with a Dirac-like Hamiltonian for massive Dirac Fermions, with an additional term to phenomenologically include the valley splitting. In contrast, in bulk WSe2 where the inversion symmetry is restored, transmission measurements show a distinctly excitonic behavior with absorption to the 1s and 2s states. Magnetic field induces a spin splitting together with a small diamagnetic shift and cyclotron like behavior at high fields, which is best described within the hydrogen model.