Ricardo M. Ribeiro

TL;DR: Transition metal dichalcogenides sandwiched between two layers of graphene produce an enhanced photoresponse, which allows development of extremely efficient flexible photovoltaic devices with photoresponsivity above 0.1 ampere per watt (corresponding to an external quantum efficiency of above 30%).

TL;DR: This work investigates the conduction band valley structure in few-layer MX2 by examining the temperature-dependent shift of indirect exciton photoluminescence peak and identifies the origin of the indirect emission and concurrently determine the relative energy of these valleys.

TL;DR: The experimental and simulation results reveal that photoexcited electron-hole pairs in the nesting region spontaneously separate in k-space, relaxing towards immediate band extrema with opposite momentum, implying that the loss of photocarriers due to direct exciton recombination is temporarily suppressed for excitation in resonance with band nesting.

TL;DR: In this article, the authors studied the optical conductivity of two-dimensional (2D) semiconducting transition metal dichalcogenides using ab initio density functional theory and found that this class of materials presents large optical response due to the phenomenon of band nesting.

TL;DR: In this article, the authors determine the band structure of graphene under strain using density functional calculations and extract the best fit to the tight-binding hopping parameters used in a recent microscopic model of strained graphene.