Fig. 2: Observed scaling of the van der Waals coefficient.
From: Asymmetric Rydberg blockade of giant excitons in Cuprous Oxide
Measured values (black dots) and theoretical prediction following Eq. (3) (black line) for the inter-state van der Waals coefficient \({C}_{6}(n,{n}^{\prime})\), that yields the strength of long-range interactions between excitons with different principal quantum numbers n and \({n}^{\prime}\). Here, \({n}^{\prime}=16\) is held fixed while varying n, whereby the theory curve has been scaled to match the experiment at n = 18. For \(n\ll {n}^{\prime}\), theory and experiment give a simple ~ n7 scaling (blue), which flattens in the opposite limit, when approaching the expected ~ n4 behavior for \(n\gg {n}^{\prime}\). The error bars denote the standard deviation.
