We are pleased to announce the opening of a post at the level of Senior Lecturer / Associate Professor at Aix-Marseille University in spring 2019. We are looking for a theoretician in condensed matter with significant experience in electronic structure calculations and atomistic simulations (e.g. DFT, TD-DFT, ab-initio methods, Monte Carlo sampling, molecular dynamics)…. 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
Luminescence of hexagonal boron nitride (hBN) has puzzled researchers for long time. In standard solid state physics textbooks direct band gap semiconductors are considered efficient light emitters while indirect ones are regarded as inefficient. Hexagonal boron nitride seems to defy this rule. In fact hBN emits light in the ultraviolet with an efficient comparable to… Read More
In this work we study how different atomic configurations, and electronic correlation modify the exciton dispersion in hexagonal boron nitride. We use two different approaches, ab-initio DFT plus many-body perturbation theory and tight-binding. We found that in the case of AB-stacking electronic correlation inverts the nature of the optical gap, from indirect to direct respect… Read More
Our Prace research project OPTEL2D “Opto-electronic properties of 2D Transition Metal Dichalcogenides with DFT and post-DFT simulations” has been accepted, and we got 49.5 million core hours on Marconi – KNL. Here the project description: “Two-dimensional (2D) and layered materials possess novel combinations of electronic and optical properties and thus present a unique… Read More
The Interdisciplinary Nanoscience Center of Marseille (CINaM), a laboratory working under the joint authority of the Centre National de la Recherche Scientifique (CNRS)and the Aix-Marseille University (AMU), invites applications for a full-time endowed position at a Professor level. The research activity will be developed in the Theory and Computer Simulation department, in relation with experimental… 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
My collaborator Myrta Grüning gave a very interesting talk about the role of excitons in non-linear optical properties of 2D materials at the OSI 2017 conference. She discusses both second and third harmonic generation in low dimensional nanostructures. Slides of her talk are available here .
The second general meeting of the GDR-REST will be held in the Porquerolles island from 22.05. to 25.05.2018. This meeting aims to bring together different communities of theoretical spectroscopy which are/were historically separated, but unified under a very precise and important subject: the excited-states spectroscopy of variety of systems (for both weakly and strongly correlated… Read More
New talk for the conference “2D layered materials for opto-electronics: a theoretical/computational perspective” in Rome. In this work we study excitations in hexagonal Boron Nitride that are invisible in linear optical response. We show that these dark states can be measured with other spectroscopic techniques and they play an important roles in the luminescence response… Read More