Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides

2016/12/08 by Maciej R. Molas, M. R. Molas, C. Faugeras +7 · 7 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Atomic physics #Chemistry #Condensed matter physics #Exciton #Graphene research and applications #Magnetic field #Materials science #Monolayer #Nanotechnology #Optoelectronics #Perovskite Materials and Applications #Photoluminescence #Physics #Transition metal #cond-mat.mes-hall

paper · pdf · doi:10.1088/2053-1583/aa5521

published as 2D Materials 4, 021003 (2017) · 7 pages, 3 figures

arxiv created 2016/12/08 · openalex publication_date 2016/12/21 · arxiv updated 2017/01/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We present low-temperature magneto-photoluminescence experiments which demonstrate the brightening of dark excitons by an in-plane magnetic field B applied to monolayers of different semiconducting transition metal dichalcogenides. For WSe 2 and WS 2 monolayers, the dark exciton emission is observed at ∼50 meV below the bright exciton peak and displays a characteristic doublet structure whose intensity grows with B 2 , while no magnetic field induced emission peaks appear for MoSe 2 monolayer. Our experiments also show that the MoS 2 monolayer has a dark exciton ground state with a dark-bright exciton splitting energy of ∼100 meV.

Citations

• Valley polarization in MoS2 monolayers by optical pumping
• Valley-selective circular dichroism of monolayer molybdenum disulphide

Cited by

• Multipath Optical Recombination of Intervalley Dark Excitons and Trions in Monolayer WSe2
• Fine structure and lifetime of dark excitons in transition metal dichalcogenide monolayers
• Dark-state impact on the exciton recombination of WS2 monolayers as revealed by multi-timescale pump-probe spectroscopy
• Valley polarization of exciton–polaritons in monolayer WSe 2 in a tunable microcavity
• Tuning carrier concentration in a superacid treated MoS2 monolayer
• Radiative lifetime of localized excitons in transition-metal dichalcogenides
• Radiative control of dark excitons at room temperature by nano-optical antenna-tip Purcell effect