NMR linewidth and skyrmion localization in quantum Hall ferromagnets

The nonmonotonic behavior of the NMR signal linewidth in the 2D quantum Hall system is explained in terms of the interplay between skyrmions localization, due to the influence of disorder, and the nontrivial temperature dependent skyrmion dynamics.

Figure 1

Effective potential in $K$ as a function of ${\mathbf{r}}_0$ (the skyrmion-donors distance in the 2DEG). The continuous line corresponds to $d=900$ and the dashed line to $d=1800$.

Figure 2

$T_2^{-1}$ (FWHM) as a function of temperature for $U_0=7\mathrm{K}$, $\Delta =2\mathrm{K}$, $g=2\mathrm{K}$ and different filling factor values.