Physical Review Letters
Multidimensional coherent spectroscopy directly unravels multiply excited states that overlap in a linear spectrum. We report multidimensional coherent optical photocurrent spectroscopy in a semiconductor polariton diode and explore the excitation ladder of cavity polaritons. We measure doubly and triply avoided crossings for pairs and triplets of exciton polaritons, demonstrating the strong coupling between light and dressed doublet and triplet semiconductor excitations. These results demonstrate that multiply excited excitonic states strongly coupled to a microcavity can be described as two coupled quantum-anharmonic ladders.
National Science Foundation
Physics and Astronomy
Travis M. Autry, Gaël Nardin, Christopher L. Smallwood, Kevin Silverman, Daniele Bajoni, Aristide Lemaître, Sophie Bouchoule, Jacqueline Bloch, and Steven Cundiff. "Excitation Ladder of Cavity Polaritons" Physical Review Letters (2020). https://doi.org/10.1103/PhysRevLett.125.067403