Fig. 2.

A shows the ground-state density for a weak-coupling case with ${\lambda }_{\alpha }=1.68\hspace{0.17em}\cdot \hspace{0.17em}{10}^{-3}$ meV^1/2/nm and in B we illustrate a strong-coupling case with ${\lambda }_{\alpha }=0.134$ meV^1/2/nm. The corresponding ground-state Mxc potential for ${\lambda }_{\alpha }=1.68\hspace{0.17em}\cdot \hspace{0.17em}{10}^{-3}$ meV^1/2/nm is displayed in C and for ${\lambda }_{\alpha }=0.134$ meV^1/2/nm displayed in D. In E and F, cuts (blue ${\lambda }_{\alpha }=1.68\hspace{0.17em}\cdot \hspace{0.17em}{10}^{-3}$ meV^1/2/nm and red ${\lambda }_{\alpha }=0.134$ meV^1/2/nm) through $v_{\text{Mxc}}$ along the diagonal (C) /antidiagonal (D) are shown. The white arrow in A indicates the polarization direction of the field mode.