Electron spin ensemble strongly coupled to a three-dimensional microwave cavity

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 $g_c$ is smaller than the spin linewidth ${\gamma }_s$ or the cavity linewidth. We identify a ratio of $g_c$ to ${\gamma }_s$ ($g_c/{\gamma }_s>$ 0.64) as a condition to observe a splitting in the cavity frequency. Finally, we confirm that $g_c$ scales with $\sqrt{N}$, where $N$ is the number of polarized spins.

To appear in Appl. Phys. Lett

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