Fig. 3: Details of in-plane magnon broadening.
From: Anisotropic magnon damping by zero-temperature quantum fluctuations in ferromagnetic CrGeTe3
a INS data along the [H, H] direction with Ei = 4.7 meV and L = 3. b INS data along the [0, 0, L] direction showing a ~ 0.1 meV spin gap at the Γ point. c Magnon line-width (FWHM) as a function of reciprocal lattice vector [H, H], and its comparison with the L-dispersion FWHM (black dots) at the same momentum transfer. d Long-wavelength magnon energy as a function of [H, H] with quadratic fits (dashed lines). The solid line indicates the expected magnon dispersion calculated using LSWT with fitted parameters given in the text. The vertical and horizontal error bars in c and d represent uncertainty in fitted energy in meV and [H, H] in r.l.u., respectively.
