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Theoretical Spectroscopy Group

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The theoretical spectroscopy group is part of the Laboratoire de Solides Irradies, at the Ecole Polytechnique.

The theoretical spectroscopy group develops theoretical and numerical approaches for the calculation of electronic properties, in particular many-body effects in electronic spectra. The research profile of the group was defined in 2000; it is centered on the theoretical description of electronic excitations from first principles. The global aim is to design techniques which can be applied to a wide range of systems, from small clusters to bulk materials, from metals to insulators. These developments comprise a part of fundamental theory, the design of approximations, the implementation of the new theory in ab initio computer codes, testing and benchmarking of the results, and applications to interesting materials. Applications often combine fundamental questions and technological interest, examples being materials for data storage, for solar energy production or optoelectronics. 

 

New papers

Alessandro Nicolaou, Kari Ruotsalainen, Laura Susana, Victor ee, Luiz Tizei, Jaakko Koskelo, Takashi Taniguchi, Kenji Watanabe, Alberto Zobelli, Matteo Gatti Direct measurement of the longitudinal exciton dispersion in $h$-BN by resonant inelastic x-ray scattering Phys. Rev. B 112, 085207 (2025).
Charlotte Vernozy, Antonino Alessi, Olivier Cavani, Audrey Courpron, Johan Petit, Valérie Véniard Online and in situ investigation of electron irradiation induced optical absorption in ZnGeP2 single crystals Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 566, 165758 (2025).
Ayoub Aouina, Matteo Gatti, Lucia Reining Design principles for density functionals using a linear expansion npj Comput Mater 11, 242 (2025).
Jaakko Koskelo, Lucia Reining, Matteo Gatti Short-Range Excitonic Phenomena in Low-Density Metals Phys. Rev. Lett. 134, 046402 (2025).
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News from the group

  • ► 3 June, 2025 Carsten is back
    Carsten Ullrich, from the University of Missouri, is visiting the group this June. A big welcome to him.
  • ► 2 June, 2025 Douma is back
    Douma comes from the Université Marien Ngouabi. He arrived for a short 3-months visit last winter. He is now back for a year. A big welcome.
  • ► 16 April, 2025 Visit of Perpetua and Michele from LPS
    Perpetua Muchiri and Michele Amato, along with other members of their group from LPS, visited the group for a day. Perpetua gave a seminar about her PhD.
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