Description du sujet de thèse

Ultrafast Dynamics in 2D Quantum Materials : Two-dimensional (2D) materials are a promising platform for realizing tunable quantum states. Indeed, these materials cover almost every phenomenon in condensed matter physics such as magnetism, superconductivity, topological states, etc. These materials become strongly renormalized in the 2D limit, through a combination of quantum confinement and enhanced electronic interactions. One of the emerging routes to control the properties of 2D materials is via ultrafast light-matter interaction. In this project, we will use polarization-tailored femtosecond pulses with peculiar symmetries to induce ultrafast electronic and lattice dynamics leading to topological phase transitions in 2D materials. The nonequilibrium electronic band structure of photoexcited 2D quantum materials will be measured using time- and polarization-resolved momentum microscopy. This powerful technique relies on detecting the energy and the momentum of electrons that have been emitted from the surface of a photoexcited crystalline solid through the photoelectric effect. During this project, we will work with state-of-the-art Yb-based high-repetition-rate femtosecond laser systems, highly nonlinear optical setup (high-order harmonic generation, optical parametric amplifier) as well as cutting-edge photoelectron spectroscopy apparatus (momentum microscope).

[1] Beaulieu et al., Phys. Rev. Lett. 125, 216404 (2020)
[2] Beaulieu et al., npj Quantum Materials 6, 1-11 (2021)
[3] Beaulieu et al., Science Advances 7, eabd9275 (2021)
[4] Comby, …, and Beaulieu, Journal of Optics 24, 084003 (2022)
[5] Schüler, … and Beaulieu, Phys. Rev. X 12, 011079 (2022)
[6] Schüler, … and Beaulieu, Communication Physics 5, 164 (2022)

Contexte de travail

Centre Lasers Intenses et Applications (CELIA) - Bordeaux, France: CELIA is a center of excellence in lasers and their interaction with matter. Research is performed on laser development and ultrafast laser-matter interactions with atoms, molecules, plasmas, and solids. The candidate will be hosted by a dynamic group of researchers (http://harmodyn.celia.u-bordeaux.fr) and will benefit from the highly supportive environment at CELIA (i.e. experienced in-house laser, vacuum, and software engineers). The applicant will also benefit from a well-established network of theory collaborators. We are committed to creating an inclusive environment for everyone.

The ideal candidate for this position will own a Master (before 09-2025) and have strong skills and interests in one or more of the following areas: Angle-resolved photoemission spectroscopy, ultrafast laser science, 2D materials, topological materials, or nonlinear optics.

The starting date will be around October 2025.

Applications should include a CV, a letter of interest, and contact information for 2 references. Applications will be accepted until the position is filled.

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.