Polaronic state assisted nonlinear saturable absorption (PSA_SA) picture in LHPs. (IMAGE)

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Polaronic state assisted nonlinear saturable absorption (PSA_SA) picture in LHPs.

Caption

Fig.1|Polaronic state assisted nonlinear saturable absorption (PSA_SA) picture in LHPs. (a) Schematic diagram of Z-scan. (b) Scheme of transformation from free excitons to exciton-polaron with lattice distortion by dynamic polaronic effect. (c) Schematic diagram of the effect of polaron formation on the band structure of materials, which will cause band energy fluctuations. (d,e) Molecular dynamics simulations of band energy fluctuations. (f) Schematic of SA caused by single photon absorption under up-bandgap excitation in conventional semiconductors. (g) Schematic of PSA_SA under sub-bandgap excitation. CB and VB denote conduction band and valence band respectively.

 

Credit

Li Zhou, Yingwei Wang, Jun He

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