Contrary to common belief, dark excitons play an important role in transient absorption spectroscopy. In this work, which is currently under review by Nano Letters, we demonstrate how different dark excitons contribute to the measured transient absorption spectrum. Theory also allows us to isolate the individual contributions and evaluate their importance in the final spectrum…. Read More
Our new work on “Temperature dependent nonlinear optics” is finally online. In this work we combine many-body perturbation theory for the electron-phonon coupling with real-time dynamics for the electrons in such a way to describe the temperature effects in the non-linear response. The preprint is available here: https://arxiv.org/abs/2609.07796v1
New poster on our work on phonon-assisted light absorption and emission in cubic Boron Nitride realized by Ashwin Pillai for the Young Research Meeting is available here: ODP PDF
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
After many years the Lumen code is back.The new version of Lumen is based on Yambo 5.3.0. You can find our new code on GitLab at: https://gitlab.com/lumen-code/ Soon we will release a stable version of the code
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
Advanced quantum materials, and ultra-fast phenomena are new areas around which the Aix-Marseille University will train European doctoral students to their high qualification through the Marie Curie actions. This has been resolved by the European Research Executive Agency (REA) in the last call ‘MSCA Doctoral Networks’.In particular the CINaM and PIIM laboratory in Marseille will… Read More
A new tutorial on exciton-phonon coupling in Yambo is available. In this tutorial we will show how to generate exciton-phonon matrix elements and calculate phonon-assisted absorption and emission. In the last part of the tutorial the exciton-phonon matrix elements will be used to calculate exciton life-time. The tutorial is based on a preliminary version of… Read More