Measuring the 1s–2p splitting of direct and indirect excitons in van der Waals heterostructures allows their binding energy and dynamics to be determined.
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Cundiff, S.T. Rydberg spectroscopy of indirect excitons. Nat. Mater. 18, 658–659 (2019). https://doi.org/10.1038/s41563-019-0410-8
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DOI: https://doi.org/10.1038/s41563-019-0410-8
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