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We report an unambiguous observation of third-order nonlinear optical effect,spatial self-phase modulation (SSPM), in a MoTe2 dispersion. The values of thethird order nonlinear optical coefficients effectively for one layer MoTe2,\c{hi}(3)one-layer, are obtained through the SSPM method at excitationwavelengths 473, 532, 750 and 801 nm, respectively. The wind-chime model isused to explain the ring formation time. The wavelength dependence of\c{hi}(3)one-layer compares well with the photo-absorption spectra.Significantly, we find a correlation between \c{hi}(3) and the carrier mobility{\mu} or effective mass m*, which again further supports the laser-induced acelectron coherence in 2D materials.

Nonlinear optical response spatial self-hase modulation in MoTe2: correlations between \c{hi}(3) and mobility or effective mass