Coherent magnon optics in a ferromagnetic spinor Bose-Einstein condensate

G. Edward Marti, Andrew MacRae, Ryan Olf +3

We measure the mass, gap, and magnetic moment of a magnon in the ferromagnetic $F=1$ spinor Bose-Einstein condensate of ${}^{87}$Rb. We find an unusually heavy magnon mass of $1.038(…