Optical nonlinearities of excitons in monolayer MoS2

Article

关键词: SINGLE-LAYER MOS2;    ELECTRONIC-STRUCTURE;    GENERATION;    STATES;   

DOI  :  10.1103/PhysRevB.97.165111

来源: SCIE

【 摘 要 】

We calculate linear and nonlinear optical susceptibilities arising from the excitonic states of monolayer MoS2 for in-plane light polarizations, using second-quantized bound and unbound exciton operators. Optical selection rules are critical for obtaining the susceptibilities. We derive the valley-chirality rule for the second-order harmonic generation in monolayer MoS2 and find that the third-order harmonic process is efficient only for linearly polarized input light while the third-order two-photon process (optical Kerr effect) is efficient for circularly polarized light using a higher order exciton state. The absence of linear absorption due to the band gap and the unusually strong two-photon third-order nonlinearity make the monolayer MoS2 excitonic structure a promising resource for coherent nonlinear photonics.

【 授权许可】

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