Magneto-excitons in large area CVD grown monolayer MoS${}_2$ and MoSe${}_2$ on sapphire

Abstract

Magneto transmission spectroscopy was employed to study the valley Zeeman effect in large-area monolayer MoS${}_2$ and MoSe${}_2$. The extracted values of the valley g-factors for both A- and B-exciton were found be similar with $g_v\simeq -4.5$. The samples are expected to be strained due to the CVD growth on sapphire at high temperature ($700^{\circ }$C). However, the estimated strain, which is maximum at low temperature, is only $\simeq 0.2\%$. Theoretical considerations suggest that the strain is too small to significantly influence the electronic properties. This is confirmed by the measured value of valley g-factor, and the measured temperature dependence of the band gap, which are almost identical for CVD and mechanically exfoliated MoS${}_2$.

7 pages, 6 figures

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Cited by in corpus (27)

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• Optical properties of atomically thin transition metal dichalcogenides: Observations and puzzles
• Probing the inter-layer exciton physics in a MoS${}_2$/MoSe${}_2$/MoS${}_2$ van der Waals heterostructure
• Exciton g-factors of van der Waals heterostructures from first principles calculations
• Excitonic valley effects in monolayer WS${}_2$ under high magnetic fields
• Optical spectroscopy of excited exciton states in MoS2 monolayers in van der Waals heterostructures
• Ab-initio studies of exciton $g$ factors: Monolayer transition metal dichalcogenides in magnetic fields
• Defect healing and charge transfer mediated valley polarization in MoS${}_2$/MoSe${}_2$/MoS${}_2$ trilayer van der Waals heterostructures
• Influence of the effective layer thickness on the groundstate and excitonic properties of transition-metal dichalcogenide systems
• Fine structure of $\mathrm{K}$-excitons in multilayers of transition metal dichalcogenides
• Atomically inspired $k\cdot p$ approach and valley Zeeman effect in transition metal dichalcogenide monolayers
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Intervalley Scattering of Interlayer Excitons in a MoS${}_2$/MoSe${}_2$/MoS${}_2$ Heterostructure in High Magnetic Field
• Band nesting, massive Dirac Fermions and Valley Lande and Zeeman effects in transition metal dichalcogenides: a tight-binding model
• Charge transfer and asymmetric coupling of MoSe${}_2$ valleys to the magnetic order of CrSBr
• Spectrally narrow exciton luminescence from monolayer MoS2 exfoliated onto epitaxially grown hexagonal BN
• Controlling exciton many-body states by the electric-field effect in monolayer MoS${}_2$
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
• Monolayer transition metal dichalcogenides in strong magnetic fields: Validating the Wannier model using a microscopic calculation
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• Revealing the nature of excitons in liquid exfoliated monolayer WS2
• Theory of the Coherent Response of Magneto-Excitons and Magneto-Biexcitons in Monolayer Transition Metal Dichalcogenides
• Magneto photoluminescence measurements of tungsten disulphide monolayers
• Effects of Reduced Interlayer Interactions on the K-point Excitons of MoS${}_2$ Nanoscrolls
• Coherence and density dynamics of excitons in a single-layer MoS${}_2$ reaching the homogeneous limit