SKM 2023 – wissenschaftliches Programm
DY 12.12: Vortrag
Dienstag, 28. März 2023, 12:45–13:00, HSZ 204
Photoinduced prethermal order parameter dynamics in the two-dimensional large-N Hubbard-Heisenberg model — •Alexander Osterkorn and Stefan Kehrein — Institut für Theoretische Physik, Georg-August-Universität Göttingen, Germany
We study the microscopic dynamics of competing ordered phases in a two-dimensional correlated electron model , which is driven with a pulsed electric field of finite duration.
In order to go beyond a mean-field treatment of the electronic interactions we adopt a large-N generalization of the Hubbard model and combine it with the semiclassical fermionic truncated Wigner approximation as a time evolution method. This allows us to calculate dephasing corrections to the mean-field dynamics and to obtain stationary states, which we interpret as prethermal order.
We use this framework to simulate the light-induced transition between two competing phases (bond density wave and staggered flux) and find that the post-pulse stationary state order parameter values are not determined alone by the amount of absorbed energy but depend explicitly on the driving frequency and field direction. While the transition between the two prethermal phases takes place at similar total energies in the low- and high-frequency regimes, we identify an intermediate frequency regime for which it occurs with minimal heating .
 Phys. Rev. B 39, 11538 (1989)