Abstract
The theoretical description of dynamics in open quantum systems becomes very demanding upon inclusion of non-Markovian effects. To simplify the computational implementation for density matrix equations of motion, the secular approximation is often applied. An experimental verification of its validity though remains difficult due to uncertainties in the system parameters and the absence of qualitatively distinct features. In this paper, we present the proposal for an experimental detection protocol sensitive to nonsecular processes neglected in the secular approximation. The protocol uses a combination of multidimensional coherent spectroscopy and nanoplasmonics. It allows for studies of nonsecular processes in various systems and provides a tool to experimentally verify the validity of the secular approximation. We apply this protocol to a system of CdSe/ZnS nanostructures and discuss the particular features originating from nonsecular processes on the resulting two-dimensional spectra.
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