Quasiparticle energies and excitonic effects of the two-dimensional carbon allotrope graphdiyne: Theory and experiment - Guangfu Luo; Xuemin Qian; Huibiao Liu; Rui Qin; Jing Zhou; Linze Li; Zhengxiang Gao; Enge Wang; Wai-Ning Mei; Jing Lu; Yuliang Li; Shigeru Nagase (Physical Review B - Condensed Matter and Materials Physics, 2011)