Magneto-excitons in large area CVD grown monolayer MoS₂ and MoSe₂ on sapphire
Mitioglu, A. A. · Galkowski, K. · Surrente, A. · Klopotowski, L. · Dumcenco, D. · Kis, A. · Maude, D. K. · Plochocka, P.
Original · EN
Magneto transmission spectroscopy was employed to study the valley Zeeman effect in large-area monolayer MoS₂ and MoSe₂. The extracted values of the valley g-factors for both A- and B-exciton were found be similar with gᵥ ≃ -4.5. The samples are expected to be strained due to the CVD growth on sapphire at high temperature (700). However, the estimated strain, which is maximum at low temperature, is only ≃ 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 MoS₂.
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