Internship and thesis proposals
Using Graphene to Probe Strong-Field Quantum Electrodynamics

Domaines
Condensed matter
Low dimension physics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter

Type of internship
Expérimental et théorique
Description
Strong-field QED predicts spectacular effects, such as the decay of the vacuum into particle–antiparticle pairs (the Schwinger effect), but testing them requires fields of ~10¹⁸ V/m, far beyond petawatt lasers, and is not expected before the 2060s. Graphene offers a way around: its electrons behave as massless Dirac fermions moving at vF = c/300, so the Schwinger field drops from ~10¹⁸ V/m in vacuum to ~10⁶ V/m in a table-top transistor. In 2023 we achieved the first quantitative observation of the Schwinger effect in a graphene transistor at room temperature [Nature Physics 19, 830 (2023)]. This experimental internship opens QEDene, a 4-year ANR project with the objectives to (i) locate where and how the Schwinger effect nucleates inside the graphene channel transistor using scanning probes, optoelectronics and advanced device designs; (ii) test new strong-field QED predictions: photo-assisted Schwinger effect, Schwinger luminescence, and "vacuum boiling" regime where the dielectric permittivity itself is modified by the presence of a strong field.

Contact
Emmanuel Baudin
Laboratory : LPENS - UMR 8023
Team : Nano-optique
Team Website
/ Thesis :    Funding :