Theory of Neutral and Charged Excitons in Monolayer Transition Metal Dichalcogenides

2013/05/21 by Timothy C. Berkelbach, Mark S. Hybertsen, David R. Reichman · 3 citations
Physics and Astronomy · #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevb.88.045318

published as Phys. Rev. B 88, 045318 (2013) · 5+1 pages, 3 figures

arxiv created 2013/05/21 · arxiv updated 2015/08/12

Abstract

We present a microscopic theory of neutral excitons and charged excitons (trions) in monolayers of transition metal dichalcogenides, including molybdenum disulfide. Our theory is based on an effective mass model of excitons and trions, parametrized by ab initio calculations and incorporating a proper treatment of screening in two dimensions. The calculated exciton binding energies are in good agreement with high-level many-body computations based on the Bethe-Salpeter equation. Furthermore, our calculations for the more complex trion species compare very favorably with recent experimental measurements, and provide atomistic insight into the microscopic features which determine the trion binding energy.

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