In this talk I present our study of shift current(SC) response in twisted bi-layer(TBG) and twisted tri-layer graphene (TTG). We found that TTG as an ideal platform for the observation of a highly controllable SC conductivity in the THz/infrared frequency regime. At small angle it is possible to promotes the far-infrared THz SC up to… Read More
The interplay between magnetism and light absorption holds promise for novel photovoltaic technologies, and recent research explores this connection within the unique structure of graphene. Yuncheng Mao and Claudio Attaccalite, both from CNRS/Aix-Marseille Université, investigate how magnetic fields influence the bulk photovoltaic effect in Bernal bilayer graphene, a material formed by stacking two graphene layers…. Read More
Here my new presentation on “Shift current from models to ab-initio”. In this presentation I discuss our recent results on shift-current in twisted 3-layer graphene and Janus Monolayer Transition-Metal Dichalcogenides. In the first work we highlight the importance of density of state plus quantum geometric effects for the SC generaiton, while in the second we… Read More
A new poster for the general conference of the French Physical Society on: tunable second harmonic generation in 2D crystals. In this work we investigate two possible mechanisms to tune SHG in 2D crystals: 1) the breaking of inversion symmetry by an external field 2) the doping effects on the excitonic SHG response. Poster source… Read More
In this talk I present our new results on sum/difference frequency generation in 2D material. We also discuss the possibility to tune non-linear response using static or ThZ electric fields, you can find the slides of my talk here:SumFrequencyGeneration.odp and the two reference papers here: Sum frequency generation from real-time simulations in two-dimensional crystals MN…. Read More
PhD position at CINaM/Aix-Marseille Université on Theory of High-Harmonic Generation A PhD position is available in the Theory and Numerical Simulations group at CINaM, Marseille, France (see: https://www.cinam.univ-mrs.fr/) under the supervision of Claudio Attaccalite , Aurélien Manchon and Fabienne Michelini (IM2NP). The expected start date from October/November 2023 or later. The PhD project will deal… Read More
This yers I’m been invited to give a lecture at the “Theoretical Spectroscopy Lectures” that will be held in Lausanne from March 21st to March 25th.The school focuses on these points, covering theoretical, practical, and also numerical aspects of TDDFT and MBPT, and codes implementing them (ABINIT, DP, 2Light, EXC). -Spectroscopy techniques. Connection between microscopic… Read More
Single-layer monochalcogenides have recently attracted much attention in the scientific community for their strong non-linear response, in particular the second harmonic generation(SHG). The origin of this strong response is still debated. A strong mismatch exist between theory and experiments. In order to clarify this issue, in this work we performed first-principles calculation of linear and… Read More
This year I was invited to give two lectures at the school on “Theoretical Spectroscopy” organized by F. Sottile, V. Olevano and G. Rignanese. I will present two lectures on “Non-linear approaches to TDDFT :: non perturbative real-time” and “Bethe-Salpeter Equation in real time” and a tutorial on the Lumen code. All the lectures are… Read More
In this work we combine tight-binding calculations of the two-photon transition probability with sophisticated ab-initio real-time Bethe-Salpeter simulations of the two-photon resonance third-order susceptibility. This combination is a unique feature of this work: on the one hand the tight-binding calculations allow us to identify the symmetry properties of the excitons, on the other hand the… Read More