Antiferromagnetic resonance and terahertz continuum in $\alpha -$RuCl${}_3$

A. Little, Liang Wu, P. Lampen-Kelley +8

We report measurements of optical absorption in the zig-zag antiferromagnet $\alpha$-RuCl${}_3$ as a function of temperature, $T$, magnetic field, $B$, and photon energy, $\hslash \omega$ in the…