Trapped Bose–Einstein condensates with quadrupole–quadrupole interactions<xref rid="cpb_27_12_120307fn1" ref-type="fn">*</xref><fn id="cpb_27_12_120307fn1"><label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11434011, 11674334, and 11747601) and the Key Research Program of the Chinese Academy of Sciences (Grant No. XDPB08-1).</p></fn>

Trapped Bose–Einstein condensates with quadrupole–quadrupole interactions**

Project supported by the National Natural Science Foundation of China (Grant Nos. 11434011, 11674334, and 11747601) and the Key Research Program of the Chinese Academy of Sciences (Grant No. XDPB08-1).

Wang An-Bang^{1, 2}, Yi Su^{1, 2, 3, †}

(color online) (a) Stability diagram on the (λ,g_q) parameter space. The solid line is the critical QQI strength obtained via full numerical calculations, while the dashed line is obtained via Eq. (14) using condensate peak density along the solid line. Panels (b)–(d) show the contour plots of the condensate density for parameter sets (λ,g_q) = (1/8,38), (1,33), and (8,52), respectively. Three triangles in panel (a) marks the positions of these parameter sets.