Abstract Nonlinear optical properties, such as bulk photovoltaic effects, possess great potential in energy harvesting, photodetection, rectification, etc. To enable efficient light–current conversion, materials with strong photo-responsivity are highly desirable. In this work, we predict that monolayer Janus transition metal dichalcogenides (JTMDs) the 1T′ phase colossal nonlinear photoconduct...

Second-harmonic generation (SHG) is a well-known nonlinear spectroscopy method to probe electronic structure, specifically, in transition metal dichalcogenide (TMDC) monolayers. This work investigates the dynamics of strongly excited TMDC monolayer by solving time evolution equations for density matrix. It shown that presence excitons qualitatively changes leading, particular, huge enhancement ...

Twisted bilayer transition metal dichalcogenides are ideal platforms to study flat-band phenomena. In this paper, we investigate plasmons in the hole-doped twisted ${\mathrm{MoS}}_{2}$ (tb-${\mathrm{MoS}}_{2}$) by employing a full tight-binding model and random phase approximation. When considering lattice relaxations tb-${\mathrm{MoS}}_{2}$, flat band is not separated from remote valence bands...

Monolayer transition metal dichalcogenides (TMDs) are direct gap semiconductors that hold great promise for advanced applications in photonics and optoelectronics. Understanding the interplay between their radiative non-radiative recombination pathways is thus of crucial importance not only fundamental studies but also design future nanoscale on-chip devices. Here, we investigate doping exciton...