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) Angular dependence of the QQI, i.e., Y₄₀(θ,φ). Positive (negative) value represents repulsive (attractive) region. Dashed lines mark the boundaries between the attractive and repulsive regions where the QQI vanishes.