Controlled coherent-coupling and dynamics of exciton complexes in a MoSe2 monolayer. (1st April 2023)

• Record Type: Journal Article
• Authors: Rodek, Aleksander; Hahn, Thilo; Howarth, James; Taniguchi, Takashi; Watanabe, Kenji; Potemski, Marek; Kossacki, Piotr; Wigger, Daniel; Kasprzak, Jacek
• Is Part Of: 2D materials. Volume 10:Number 2(2023)
• Publication Date: 2023-04-01
• Subjects: transition metal dichalcogenides -- coherent nonlinear spectroscopy -- ultrafast exciton dynamics -- coherent coupling -- two-dimensional spectroscopy -- four-wave mixing -- optical microscopy and imaging; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/acc59a
• Languages: English
• ISSNs: 2053-1583

Abstract

Abstract: Quantifying and controlling the coherent dynamics and couplings of optically active excitations in solids is of paramount importance in fundamental research in condensed matter optics and for their prospective optoelectronic applications in quantum technologies. Here, we perform ultrafast coherent nonlinear spectroscopy of a charge-tunable MoSe2 monolayer. The experiments show that the homogeneous and inhomogeneous line width and the population decay of exciton complexes hosted by this material can be directly tuned by an applied gate bias, which governs the Fermi level and therefore the free carrier density. By performing two-dimensional spectroscopy, we also show that the same bias-tuning approach permits us to control the coherent coupling strength between charged and neutral exciton complexes.