Second harmonic generation in h-BN and MoS2 monolayers: Role of electron-hole interaction

M. Grüning, C. Attaccalite

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We study second-harmonic generation in h-BN and MoS$_2$ monolayers using a novel \emph{ab initio} approach based on Many-body theory. We show that electron-hole interaction doubles the signal intensity at the excitonic resonances with respect to the contribution from independent electronic transitions. This implies that electron-hole interaction is essential to describe second-harmonic generation in those materials. We argue that this finding is general for nonlinear optical properties in nanostructures and that the present methodology is the key to disclose these effects.
Original languageEnglish
Article number081102
Number of pages5
JournalPhysical Review B (Condensed Matter)
Issue number9
Publication statusPublished - 03 Feb 2014


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