Abstract
In this paper we present a method to study the polarizability due to transitions between exciton states in transition metal dichalcogenides. We apply our method to the description of the excitation of $2p$ dark states. These states are not observable in absorption experiments but can be excited in a pump-probe experiment. As an example we consider $2p$ dark states in ${{\rm WSe}_2}$. We find a good agreement between recent experimental measurements and our theoretical calculations.
© 2021 Optical Society of America
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