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Interactions between Rydberg excitons in Cu$_2$O

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arxiv 1807.05896 v1 pith:F5RUNRBF submitted 2018-07-16 cond-mat.quant-gas cond-mat.mtrl-sci

Valentin Walther , Sjard Ole Krüger , Stefan Scheel , Thomas Pohl This is my paper · ORCID
classification cond-mat.quant-gascond-mat.mtrl-sci
keywords excitonsinteractionsrydberganalysisangularasymptoticsbeencollisions
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abstract

Highly-excited states of excitons in cuprous oxide have recently been observed at a record quantum number of up to $n=25$. Here, we evaluate the long-range interactions between pairs of Rydberg excitons in Cu$_2$O, which are due to direct Coulomb forces rather than short-range collisions typically considered for ground state excitons. A full numerical analysis is supplemented by the van der Waals asymptotics at large exciton separations, including the angular dependence of the potential surfaces.

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