V001 / JSI / T18


In a recently published article in Nature Physics prof. J. Bonča from the Department of Theoretical Physics, together with his former PhD students, dr. L. Vidmar and dr. D. Golež, and an experimental group from Italy, addressed one of the pivotal questions in the physics of high-temperature superconductors concerning the question of whether the low-energy dynamics of the charge carriers is mediated by bosons with a characteristic timescale. The answer to this question has remained elusive as electronic correlations are expected to greatly accelerate the electron–boson scattering processes, confining them to the very femtosecond timescale. The experimentally observed timescale is in agreement with numerical calculations on a model in which the relaxation of the photo-excited charges is achieved via inelastic scattering with short-range antiferromagnetic excitations.