Unravelling the effect of sulfur vacancies in MoS2 and clear observation of the occupied defect state induced by sulfur vacancies.

In this study, strong two-photon absorption (TPA) in a layered bismuth telluride (Bi2Te3) topological insulator (TI) is observed and investigated by the Z-scan method under excitation with a femtosecond laser pulse at a wavelength of 1056 nm.

Two-dimensional (2D) topological insulators (TIs) have attracted much attention owing to their striking optical nonlinearity. However, the ultra-low saturable intensity (SI) of TIs resulting from the bulk conduction band limits...

A z-scan technique was used to analyse the optical nonlinearity of a graphene/Bi2Te3 heterostructure under pulsed laser excitation at 800 nm. The intensity-dependent transmittance over 10 orders of magnitude indicated...

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