Please use this identifier to cite or link to this item: https://doi.org/10.1103/physrevresearch.2.033256
Title: Valley Zeeman effect and Landau levels in two-dimensional transition metal dichalcogenides
Authors: Xuan, Fengyuan 
Quek, Su Ying 
Keywords: cond-mat.mtrl-sci
cond-mat.mes-hall
physics.comp-ph
Issue Date: 17-Aug-2020
Publisher: American Physical Society (APS)
Citation: Xuan, Fengyuan, Quek, Su Ying (2020-08-17). Valley Zeeman effect and Landau levels in two-dimensional transition metal dichalcogenides. Physical Review Research 2 (3) : 033256-. ScholarBank@NUS Repository. https://doi.org/10.1103/physrevresearch.2.033256
Abstract: This paper presents a theoretical description of both the valley Zeeman effect (g-factors) and Landau levels in two-dimensional H-phase transition metal dichalcogenides (TMDs) using the Luttinger-Kohn approximation with spin-orbit coupling. At the valley extrema in TMDs, energy bands split into Landau levels with a Zeeman shift in the presence of a uniform out-of-plane external magnetic field. The Landau level indices are symmetric in the K and K ′ valleys. We develop a numerical approach to compute the single-band g-factors from first principles without the need for a sum over unoccupied bands. Many-body effects are included perturbatively within the GW approximation. Nonlocal exchange and correlation self-energy effects in the GW calculations increase the magnitude of single-band g-factors compared to those obtained from density functional theory. Our first-principles results give spin- and valley-split Landau levels, in agreement with recent optical experiments. The exciton g-factors deduced in this work are also in good agreement with experiment for the bright and dark excitons in monolayer WSe2, as well as the lowest-energy bright excitons in MoSe2 − WSe2 heterobilayers with different twist angles.
Source Title: Physical Review Research
URI: https://scholarbank.nus.edu.sg/handle/10635/194651
ISSN: 26431564
DOI: 10.1103/physrevresearch.2.033256
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