Abstract
We demonstrate the strong coupling between an electron spin ensemble and a three-dimensional cavity in a reflection geometry. We also find that an anticrossing in the cavity/spin spectrum can be observed under conditions that the collective coupling strength gc is smaller than the spin linewidth γs or the cavity linewidth. We identify a ratio of gc to γs (gc/γs>0.64) as a condition to observe a splitting in the cavity frequency. Finally, we confirm that gc scales with N, where N is the number of polarized spins.
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