CONICET | Buscador de Institutos y Recursos Humanos

There are many aspects to be studied in the interaction of twisted light (TL) with many-body systems. Most works study the interaction of TL with a single electron of a nanostructure/atom/molecule where the Coulomb interaction between particles doesn´t play a role. We also wish to study the dynamics of the interaction in real-time, which hasn´t been done yet.We focus here on the effect of the spatial inhomogeneity of the TL beam. We study this effect in parabolically confined many-body systems. In such separable systems an homogenous light fields which couples to the dipole of the system (dipole approximation) is not able to unveil many-body effects in the optical spectrum (Generalized Kohn Theorem) and the density slashes back and forth without changing its shape (Harmonic Potential Theorem). Thus under the action of a uniform light field a system of interacting particles confined in a harmonic potential shows the same behaviour as a system of non-interacting particles confined in the same harmonic potential. We would like to study how the many-body effects arise when we act on the system with a spatially inhomogenous light field as is the case of twisted light.We show results for an exactly solvable problem where we can compare the exact dynamics against simulations performed with Time-dependent Density Functional Theory (TDDFT). The idea is to gain some physical intuition on one hand and on the other hand assess the ability of available functional approximations to simulate such processes. Our first case study is a 2-electron quantum wire under the action of a quadrupole field, the later represents a particular case of TL field in one dimension.