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arXiv · 1602.01220

Magneto-excitons in large area CVD grown monolayer MoS$_{2}$ and MoSe$_{2}$ on sapphire

A. A. Mitioglu·K. Galkowski·A. Surrente·L. Klopotowski·D. Dumcenco·A. Kis·D. K. Maude·P. Plochocka
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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$_2$.

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A. A. Mitioglu, K. Galkowski, A. Surrente, L. Klopotowski, D. Dumcenco, A. Kis, D. K. Maude, P. Plochocka. 2016-02-03. Magneto-excitons in large area CVD grown monolayer MoS$_{2}$ and MoSe$_{2}$ on sapphire. https://doi.org/10.1103/physrevb.93.165412

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