Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Nonequilibrium Quantum Systems I (joint session TT/DY)
TT 25.8: Vortrag
Dienstag, 19. März 2024, 11:30–11:45, H 3005
Influence of low- and high-energy magnetic excitations on electron dynamics in the vicinity of the Mott transition: a non-equilibrium D-TRILEX study — •Nagamalleswara Rao Dasari1, Hugo U. R. Strand2, Martin Eckstein1, Alexander I. Lichtenstein1, and Evgeny A. Stepanov3 — 1Institut für Theoretische Physik, Universität Hamburg, Notkestraße 9 , 22607 Hamburg, Germany — 2School of Science and Technology, Orebro University, SE-70182 Obrebo, Sweden — 3CPHT, CNRS, École polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France
We present a simplified real-time diagrammatic method based on the dual triply irreducible local expansion (D-TRILEX) formalism and apply it to the single-band extended Hubbard model. In the vicinity of Mott-transition, we observed signatures of “water-fall" structures at low-binding energies and sharp dispersive high-energy bands in the momentum-resolved electronic spectrum. In the photo-excitation dynamics, these spectral features melt very slowly on the electronic time scale, allowing us to measure these slow dynamics in the time-resolved photo-emission spectrum. In addition, the electron-magnon interaction in metals manifests through the fast relaxation of electronic kinetic energy due to the rapid thermalization of magnons much earlier than the electron’s thermalization time scale. However, in the Mott-insulators, the photo-excited charge carriers transfer their excess kinetic energy to low-energy magnons instead of low-energy electrons (expected for impact ionization), leading to a non-thermal magnon distribution on a typical electronic time scale.
Keywords: Extended Hubbard model; Non-equilibrium D-TRILEX; Photo-excitation dynamics of correlated systems; Non-local charge and spin fluctuations; Transient response of optical conductivity