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arXiv · 1610.06780

Intrinsic exciton states mixing and non-linear optical properties in transition metal dichalcogenide monolayers

M. M. Glazov·L. E. Golub·G. Wang·X. Marie·T. Amand·B. Urbaszek
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Abstract

Optical properties of transition metal dichalcogenides monolayers are controlled by the Wannier-Mott excitons forming a series of $1s$, $2s$, $2p$,... hydrogen-like states. We develop the theory of the excited excitonic states energy spectrum fine structure. We predict that $p$- and $s$-shell excitons are mixed due to the specific $D_{3h}$ point symmetry of the transition metal dichalcogenide monolayers. Hence, both $s$- and $p$-shell excitons are active in both single- and two-photon processes providing an efficient mechanism of second harmonic generation. The corresponding contribution to the nonlinear susceptibility is calculated.

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M. M. Glazov, L. E. Golub, G. Wang, X. Marie, T. Amand, B. Urbaszek. 2016-10-21. Intrinsic exciton states mixing and non-linear optical properties in transition metal dichalcogenide monolayers. https://doi.org/10.1103/physrevb.95.035311

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