Nonequilibrium properties of strongly correlated artificial atoms-a Green's functions approach

A nonequilibrium Green's functions (NEGF) approach for spatially inhomogeneous, strongly correlated artificial atoms is presented and applied to compute the time-dependent properties starting from a (correlated) initial few-electron state at finite temperatures. In the regime of moderate-to-strong coupling, we consider the Kohn mode of a three-electron system in a parabolic confinement excited by a short-pulsed classical laser field treated in the dipole approximation. In particular, we numerically confirm that this mode is preserved within a conserving (e.g., Hartree-Fock or second Born) theory