Effective interactions between two impurities in quasi-two-dimensional dipolar Bose–Einstein condensates

Fu-Lin Deng,Tao Shi,Su Yi

Figure 4. Contour plot of (a) the excitation spectrum ${E}_{{\bf{k}}}$ and (b) ground-state energy ${ \mathcal E }({\bf{r}})$, when the dipole moments are not polarized along the z axis with P = 2, χ = 3.03, a2D = 10ℓ, and ϑ = π/4.